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Chapter 7

Conditional Statements In Java

Class 9 - APC Understanding Computer Applications with BlueJ

Multiple Choice Questions

Question 1

In a switch case, when the switch value does not respond to any case then the execution transfers to:

  1. a break statement
  2. a default case ✓
  3. a loop
  4. none

Question 2

Which of the following is a compound statement?

  1. p=Integer.parseInt(in.readLine());
  2. c=++a;
  3. if(a>b) a++; b- - ; ✓
  4. a=4;

Question 3

Condition is essentially formed by using:

  1. Arithmetic operators
  2. Relational operators
  3. Logical operators
  4. All ✓

Question 4

If(a>b)&&(a>c)), then which of the statement is true?

  1. b is the smallest number
  2. b is the greatest number
  3. a is the greatest number ✓
  4. all of the above

Question 5

if(a>b)  
c=a;   
else   
c=b;

It can be written as:

  1. c= (b>a)?a:b;
  2. c= (a!=b)?a:b;
  3. c= (a>b)?b:a;
  4. None ✓

Question 6

If a, b and c are the sides of a triangle then which of the following statement is true for: if(a!=b && a!=c && b!=c)?

  1. Equilateral triangle
  2. Scalene triangle ✓
  3. Isosceles triangle
  4. All of the above

Question 7

Two arithmetic expressions can be compared with if statement, using:

  1. Arithmetic operator
  2. Relational operator ✓
  3. Ternary operator
  4. None

Question 8

Which of the following is a conditional statement?

  1. if ✓
  2. goto
  3. for
  4. none

Question 9

Which of the following statements accomplishes 'fall through'?

  1. for statement
  2. switch statement ✓
  3. if-else
  4. none

Question 10

A Java program executes but doesn't give the desired output. It is due to:

  1. the logical error in the program ✓
  2. the syntax error in the program
  3. the run time error in the program
  4. none

Answer the Following Questions

Question 1

Name the different ways to manage the flow of control in a program.

Answer

Normal flow of control, Bi-directional flow of control, Multiple branching of control

Question 2

Mention one statement each to achieve:

(a) Bi-directional flow of control

Answer

if-else statement

(b) Multiple branching of control

Answer

switch statement

Question 3

Explain the following statements with their constructs:

(a) nested if

Answer

We can write an if-else statement within another if-else statement. We call this nested if. It has the following syntax:

if (condition 1) {
    if (condition 2) {
        Statement a;
        Statement b;
        ..
    }
    else {
        Statement c;
        Statement d;
        ..
    }
}
else {
    if (condition 3) {
        Statement e;
        Statement f;
        ..
    }
    else {
        Statement g;
        Statement h;
        ..
    }
}

(b) if - else

Answer

if - else statement is used to execute one set of statements when the condition is true and another set of statements when the condition is false. It has the following syntax:

if (condition 1) {
    Statement a;
    Statement b;
    ..
}
else {
    Statement c;
    Statement d;
    ..
}

(c) if - else - if

Answer

if - else - if ladder construct is used to test multiple conditions and then take a decision. It provides multiple branching of control. It has the following syntax:

if (condition)
    statement;
else if (condition) 
    statement;
else if (condition) 
    statement;
..
..
else
    statement;

Question 4

Differentiate between if and switch statement.

Answer

Following are the difference between if and switch statement:

  1. switch can only test for equality whereas if can test for any Boolean expression.
  2. switch tests the same expression against constant values while if-else-if ladder can use different expression involving unrelated variables.
  3. switch expression must only evaluate to byte, short, int, char, String or an enum. if doesn’t have such limitations.
  4. A switch statement will run much faster than the equivalent program written using the if-else-if ladder

Question 5

What is the purpose of switch statement in a program?

Answer

switch statement in a program, is used for multi-way branch. It compares its expression to multiple case values for equality and executes the case whose value is equal to the expression of switch. If none of the cases match, default case is executed. If default case is absent then none of the statements from switch are executed.

Question 6

Explain with the help of an example, the purpose of default in a switch statement.

Answer

When none of the case values are equal to the expression of switch statement then default case is executed. In the example below, value of number is 4 so case 0, case 1 and case 2 are not equal to number. Hence sopln of default case will get executed printing "Value of number is greater than two" to the console.

int number = 4;
    
switch(number) {
    
    case 0:
        System.out.println("Value of number is zero");
        break;
        
    case 1:
        System.out.println("Value of number is one");
        break;
        
    case 2:
        System.out.println("Value of number is two");
        break;
        
    default:
        System.out.println("Value of number is greater than two");
        break;
        
}

Question 7

Is it necessary to use 'break' statement in a switch case statement? Explain.

Answer

Use of break statement in a switch case statement is optional. Omitting break statement will lead to fall through where program execution continues into the next case and onwards till end of switch statement is reached.

Question 8

Explain 'Fall through' with reference to a switch case statement.

Answer

break statement at the end of case is optional. Omitting break leads to program execution continuing into the next case and onwards till a break statement is encountered or end of switch is reached. This is termed as Fall Through in switch case statement.

Question 9

What is a compound statement? Give an example.

Answer

Two or more statements can be grouped together by enclosing them between opening and closing curly braces. Such a group of statements is called a compound statement.

if (a < b) {
            
    /*
    * All statements within this set of braces 
    * form the compound statement
    */

    System.out.println("a is less than b");
    a = 10;
    b = 20;
    System.out.println("The value of a is " + a);
    System.out.println("The value of b is " + b);
            
}

Question 10

Explain with an example the if-else-if construct.

Answer

if - else - if ladder construct is used to test multiple conditions and then take a decision. It provides multiple branching of control. Below is an example of if - else - if:

if (marks < 35)
    System.out.println("Fail");
else if (marks < 60)
    System.out.println("C grade");
else if (marks < 80)
    System.out.println("B grade");
else if (marks < 95)
    System.out.println("A grade");
else
    System.out.println("A+ grade");

Question 11

Name two jump statements and their use.

Answer

break statement, it is used to jump out of a switch statement or a loop. continue statement, it is used to skip the current iteration of the loop and start the next iteration.

Question 12

Give two differences between the switch statement and the if-else statement.

Answer

switchif-else
switch can only test if the expression is equal to any of its case constantsif-else can test for any boolean expression like less than, greater than, equal to, not equal to, etc.
It is a multiple branching flow of control statementIt is a bi-directional flow of control statement

Predict the Output of the Given Snippet, when Executed

Question 1

int a=1,b=1,m=10,n=5; 
if((a==1)&&(b==0))
{
System.out.println((m+n)); 
System.out.println((m—n));
}
if((a==1)&&(b==1))
{
System.out.println((m*n)); 
System. out.println((m%n));
}
Output
50
0
Explanation

First if condition is false, second if condition is true. Statements inside the code block of second if condition are executed.
m*n => 10 * 5 => 50
m%n => 10 % 5 => 0

Question 2

int x=1,y=1;
if(n>0) 
{
x=x+1; 
y=y+1;
}

What will be the value of x and y, if n assumes a value (i) 1 (ii) 0?

Output

(i) n = 1

x = 2
y = 2

(ii) n = 0

x = 1
y = 1
Explanation

When n = 1, if condition is true, its code block is executed adding 1 to both x and y. When n = 0, if condition is false so x and y retain their original values.

Question 3

int b=3,k,r;
float a=15.15,c=0;
if(k==1)
{
r=(int)a/b;
System.out.println(r);
}
else
{
c=a/b; 
System.out.println(c);
}
Output
Compile time error in the line if(k==1)
"variable k might not have been initialized"
Explanation

Assuming k to be a local variable declared inside a method, we are using k in the if condition before initializing it i.e. before assigning any value to k. Due to this, the above code will generate a compile time error.

Question 4

switch (opn)
{
case 'a':
System.out.println("Platform Independent"); 
break;
case 'b':
System.out.println("Object Oriented");
case 'c':
System.out.println("Robust and Secure"); 
break;
default:
System.out.println("Wrong Input");
}

When (i) opn = 'b' (ii) opn = 'x' (iii) opn = 'a'

Output

(i) opn = 'b'

Object Oriented
Robust and Secure
Explanation

case 'b' is matched, "Object Oriented" gets printed to the console. As there is no case statement in case 'b', program control falls through to case 'c' printing "Robust and Secure" to the console. case 'c' has a break statement which transfers the program control outside switch statement.

(ii) opn = 'x'

Wrong Input
Explanation

None of the 3 cases match so default case is executed.

(ii) opn = 'a'

Platform Independent
Explanation

case 'a' is matched, "Platform Independent" gets printed to the console. break statement in case 'a' transfers the program control outside switch statement.

Correct the errors in the given programs

Question 1

class public
{
public static void main(String args{})
{
int a=45,b=70,c=65.45;
sum=a+b;
diff=c-b;
System.out.println(sum,diff);
} 
}
Explanation
  1. public is a keyword so it can't be used as an identifier for naming the class. Change the class name from public to any valid identifier, for example class Sample
  2. Argument of main method is an array of Strings. Use square brackets instead of curly brackets — String args[]
  3. c is an int variable. We cannot assign a double literal 65.45 to it.
  4. Variables sum & diff are not defined
  5. The line System.out.println(sum,diff); should be written like this System.out.println(sum + " " + diff);
Corrected Program
class Sample  //1st correction
{
public static void main(String args[]) //2nd correction
{
int a=45,b=70,c=65; //3rd correction
int sum=a+b;        //4th Correction
int diff=c-b;
System.out.println(sum + " " + diff);  //5th Correction
} 
}

Question 2

class Square
{
public static void main(String args[])
{
int n=289,r;
r=sqrt(n);
if(n==r)
System.out.println("Perfect Square"); 
else
System.out.println("Not a Perfect Square");
} 
}
Explanation
  1. Variable r must be of double type as Math.sqrt method returns a double value.
  2. The line r=sqrt(n); should be r=Math.sqrt(n);
Corrected Program
class Square
{
public static void main(String args[])
{
int n=289;
double r=Math.sqrt(n); //1st & 2nd correction
if(n==r)
System.out.println("Perfect Square"); 
else
System.out.println("Not a Perfect Square");
} 
}

Question 3

    
class Simplify
{
public static void main(String args[])
{
int a,b,c,d;
a=10,b=5,c=1,d=2; 
c=a2+b2;
d=(a+b)2;
p=c/d;
System.out.println(c + " "+ " "+d+ " "+p);
} 
}
Explanation
  1. The line a=10,b=5,c=1,d=2; generates a compile time error. We will combine the declaration and initialization of these variables.
  2. The line c=a2+b2; is written in Java like this c = (int)(Math.pow(a, 2) + Math.pow(b, 2));
  3. The line d=(a+b)2; is written in Java like this d=(int)Math.pow((a+b), 2);
  4. Variable p is not defined
Corrected Program
class Simplify
{
public static void main(String args[])
{
int a=10,b=5,c=1,d=2;                       //1st correction
c = (int)(Math.pow(a, 2) + Math.pow(b, 2)); //2nd correction
d = (int)Math.pow((a+b), 2);                //3rd correction
int p=c/d;                                  //4th correction
System.out.println(c + " "+ " "+d+ " "+p);
} 
}

Question 4

class Sample
{
public static void main(String args[])
{
int n,p;
float k,r;
n=25;p=12; 
if(n=25)
{
k=pow(p,2)
System.out.println("The value of"+p+ " = "+k);
}
else
{
r=Math.square root(n); 
System.out.println("The value of"+n+ " = "+r);
} 
} 
}
Explanation
  1. The line if(n=25) should be if(n==25)
  2. The line k=pow(p,2) should be k=(float)Math.pow(p,2);
  3. The line r=Math.square root(n); should be r=(float)Math.sqrt(n);
Corrected Program
class Sample
{
public static void main(String args[])
{
int n,p;
float k,r;
n=25;p=12; 
if(n==25)               //1st correction
{
k=(float)Math.pow(p,2); //2nd correction
System.out.println("The value of"+p+ " = "+k);
}
else
{
r=(float)Math.sqrt(n);  //3rd correction
System.out.println("The value of"+n+ " = "+r);
} 
} 
}

Solutions to Unsolved Java Programs

Question 1

Write a program to input three angles of a triangle and check whether a triangle is possible or not. If possible then check whether it is an acute-angled triangle, right-angled or an obtuse-angled triangle otherwise, display 'Triangle not possible'.
Sample Input: Enter three angles: 40, 50, 90
Sample Output: Right=angled Triangle

import java.util.Scanner;

public class KboatTriangleAngle
{
   public static void main(String args[]) {
       Scanner in = new Scanner(System.in);
       System.out.print("Enter first angle: ");
       int a1 = in.nextInt();
       System.out.print("Enter second angle: ");
       int a2 = in.nextInt();
       System.out.print("Enter third angle: ");
       int a3 = in.nextInt();
       int angleSum = a1 + a2 + a3;
       
       if (angleSum == 180 && a1 > 0 && a2 > 0 && a3 > 0) {
           if (a1 < 90 && a2 < 90 && a3 < 90) {
               System.out.println("Acute-angled Triangle");
           }
           else if (a1 == 90 || a2 == 90 || a3 == 90) {
               System.out.println("Right-angled Triangle");
           }
           else {
               System.out.println("Obtuse-angled Triangle");
           }
       }
       else {
           System.out.println("Triangle not possible");
       }
   }
}
Output
BlueJ output of KboatTriangleAngle.java

Question 2

Write a program to input the cost price and the selling price of an article. If the selling price is more than the cost price then calculate and display actual profit and profit per cent otherwise, calculate and display actual loss and loss per cent. If the cost price and the selling price are equal, the program displays the message 'Neither profit nor loss'.

import java.util.Scanner;

public class KboatProfit
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter cost price of the article: ");
        double cp = in.nextDouble();
        System.out.print("Enter selling price of the article: ");
        double sp = in.nextDouble();
        double pl = sp - cp;
        double percent = Math.abs(pl) / cp * 100;
        if (pl > 0) {
            System.out.println("Profit = " + pl);
            System.out.println("Profit % = " + percent);
        }
        else if (pl < 0) {
            System.out.println("Loss = " + Math.abs(pl));
            System.out.println("Loss % = " + percent);
        }
        else {
            System.out.println("Neither profit nor loss");
        }
    }
}
Output
BlueJ output of KboatProfit.java
BlueJ output of KboatProfit.java

Question 3

Write a program to input three numbers and check whether they are equal or not. If they are unequal numbers then display the greatest among them otherwise, display the message 'All the numbers are equal'.
Sample Input: 34, 87, 61
Sample Output: Greatest number: 87
Sample Input: 81, 81, 81
Sample Output: All the numbers are equal.

import java.util.Scanner;

public class Kboat3Numbers
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter first number: ");
        int a = in.nextInt();
        System.out.print("Enter second number: ");
        int b = in.nextInt();
        System.out.print("Enter third number: ");
        int c = in.nextInt();
        
        if (a == b && b == c) {
            System.out.println("All the numbers are equal");
        }
        else {
            int g = a;
            
            if (b > g)
                g = b;
                
            if (c > g)
                g = c;
                
            System.out.println("Greatest number: " + g);
        }
    }
}
Output
BlueJ output of Kboat3Numbers.java
BlueJ output of Kboat3Numbers.java

Question 4

Write a program to accept a number and check whether the number is divisible by 3 as well as 5. Otherwise, decide:
(a) Is the number divisible by 3 and not by 5?
(b) Is the number divisible by 5 and not by 3?
(c) Is the number neither divisible by 3 nor by 5?
The program displays the message accordingly.

import java.util.Scanner;

public class Divisor
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter number: ");
        int num = in.nextInt();
        
        if (num % 3 == 0 && num % 5 == 0)
            System.out.println("Divisible by 3 and 5");
        else if (num % 3 == 0)
            System.out.println("Divisible by 3 but not by 5");
        else if (num % 5 == 0)
            System.out.println("Divisible by 5 but not by 3");
        else
            System.out.println("Neither divisible by 3 nor by 5");
    }
}
Output
BlueJ output of Divisor.java

Question 5

Write a program to input year and check whether it is:
(a) a Leap year (b) a Century Leap year (c) a Century year but not a Leap year
Sample Input: 2000
Sample Output: It is a Century Leap Year.

import java.util.Scanner;

public class KboatCenturyLeapYear
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the year to check: ");
        int yr = in.nextInt();

        if (yr % 4 == 0 && yr % 100 != 0)
            System.out.println("It is a Leap Year");
        else if (yr % 400 == 0)
            System.out.println("It is a Century Leap Year");
        else if (yr % 100 == 0)
            System.out.println("It is a Century Year but not a Leap Year");
        else
            System.out.println("It is neither a Century Year nor a Leap Year");
    }
}
Output
BlueJ output of KboatCenturyLeapYear.java

Question 6

Write a program to input two unequal positive numbers and check whether they are perfect square numbers or not. If the user enters a negative number then the program displays the message 'Square root of a negative number can't be determined'.
Sample Input: 81, 100
Sample Output: They are perfect square numbers.
Sample Input: 225, 99
Sample Output: 225 is a perfect square number.
                          99 is not a perfect square number.

import java.util.Scanner;

public class KboatPerfectSquare
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter first number: ");
        int a = in.nextInt();
        System.out.print("Enter second number: ");
        int b = in.nextInt();
        
        if (a < 0 || b < 0) {
            System.out.println("Square root of a negative number can't be determined");
        }
        else {
            double sqrtA = Math.sqrt(a);
            double sqrtB = Math.sqrt(b);
            double isAPerfectSq = sqrtA - Math.floor(sqrtA);
            double isBPerfectSq = sqrtB - Math.floor(sqrtB);
            
            if (isAPerfectSq == 0 && isBPerfectSq == 0) {
                System.out.println("They are perfect square numbers.");
            }
            else if (isAPerfectSq == 0) {
                System.out.println(a + " is a perfect square number.");
                System.out.println(b + " is not a perfect square number.");
            }
            else if (isBPerfectSq == 0) {
                System.out.println(a + " is not a perfect square number.");
                System.out.println(b + " is a perfect square number.");
            }
            else {
                System.out.println("Both are not perfect square numbers.");
            }
        }
    }
}
Output
BlueJ output of KboatPerfectSquare.java
BlueJ output of KboatPerfectSquare.java

Question 7

Without using if-else statement and ternary operators, accept three unequal numbers and display the second smallest number.
[Hint: Use Math.max( ) and Math.min( )]
Sample Input: 34, 82, 61
Sample Output: 61

import java.util.Scanner;

public class Kboat2ndSmallestNumber
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter 3 unequal numbers");
        System.out.print("Enter first number: ");
        int a = in.nextInt();
        System.out.print("Enter second number: ");
        int b = in.nextInt();
        System.out.print("Enter third number: ");
        int c = in.nextInt();
        
        int sum = a + b + c;
        int big = Math.max(a, b);
        big = Math.max(big, c);
        int small = Math.min(a, b);
        small = Math.min(small, c);
        int result = sum - big - small;
        System.out.println("Second Smallest Number = " + result);
        
    }
}
Output
BlueJ output of Kboat2ndSmallestNumber.java

Question 8

Write a program to input three unequal numbers. Display the greatest and the smallest number.
Sample Input: 28, 98, 56
Sample Output: Greatest Number: 98
                           Smallest Number: 28

import java.util.Scanner;

public class KboatMinMaxNumbers
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter 3 unequal numbers");
        System.out.print("Enter first number: ");
        int a = in.nextInt();
        System.out.print("Enter second number: ");
        int b = in.nextInt();
        System.out.print("Enter third number: ");
        int c = in.nextInt();
        
        int min = a, max = a;
        min = b < min ? b : min;
        min = c < min ? c : min;
        
        max = b > max ? b : max;
        max = c > max ? c : max;
        
        System.out.println("Greatest Number: " + max);
        System.out.println("Smallest Number: " + min);
        
    }
}
Output
BlueJ output of KboatMinMaxNumbers.java

Question 9

A Pre-Paid taxi charges from the passenger as per the tariff given below:

DistanceRate
Up to 5 km₹ 100
For the next 10 km₹ 10/km
For the next 10 km₹ 8/km
More than 25 km₹ 5/km

Write a program to input the distance covered and calculate the amount paid by the passenger. The program displays the printed bill with the details given below:
Taxi No.                  :
Distance covered   :
Amount                  :

import java.util.Scanner;

public class KboatPrePaidTaxi
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Taxi Number: ");
        String taxiNo = in.nextLine();
        System.out.print("Enter distance travelled: ");
        int dist = in.nextInt();

        int fare  = 0;
        if (dist <= 5)
            fare = 100;
        else if (dist <= 15)
            fare = 100 + (dist - 5) * 10;
        else if (dist <= 25)
            fare = 100 + 100 + (dist - 15) * 8;
        else
            fare = 100 + 100 + 80 + (dist - 25) * 5;
            
        System.out.println("Taxi No: " + taxiNo);
        System.out.println("Distance covered: " + dist);
        System.out.println("Amount: " + fare);

    }
}
Output
BlueJ output of KboatPrePaidTaxi.java

Question 10

A cloth showroom has announced festival discounts and the gifts on the purchase of items, based on the total cost as given below:

Total CostDiscountGift
Up to ₹ 2,0005%Calculator
₹ 2,001 to ₹ 5,00010%School Bag
₹ 5,001 to ₹ 10,00015%Wall Clock
Above ₹ 10,00020%Wrist Watch

Write a program to input the total cost. Compute and display the amount to be paid by the customer along with the gift.

import java.util.Scanner;

public class KboatClothDiscount
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter total cost: ");
        double cost = in.nextDouble();
        String gift;
        double amt;
        
        if (cost <= 2000.0) {
            amt = cost - (cost * 5 / 100);
            gift = "Calculator";
        }
        else if (cost <= 5000.0) {
            amt = cost - (cost * 10 / 100);
            gift = "School Bag";
        }
        else if (cost <= 10000.0) {
            amt = cost - (cost * 15 / 100);
            gift = "Wall Clock";
        }
        else {
            amt = cost - (cost * 20 / 100);
            gift = "Wrist Watch";
        }
        
        System.out.println("Amount to be paid: " + amt);
        System.out.println("Gift: " + gift);
        
    }
}
Output
BlueJ output of KboatClothDiscount.java

Question 11

Given below is a hypothetical table showing rate of income tax for an India citizen, who is below or up to 60 years.

Taxable income (TI) in ₹Income Tax in ₹
Up to ₹ 2,50,000Nil
More than ₹ 2,50,000 and less than or equal to ₹ 5,00,000(TI - 1,60,000) * 10%
More than ₹ 5,00,000 and less than or equal to ₹ 10,00,000(TI - 5,00,000) * 20% + 34,000
More than ₹ 10,00,000(TI - 10,00,000) * 30% + 94,000

Write a program to input the name, age and taxable income of a person. If the age is more than 60 years then display the message "Wrong Category". If the age is less than or equal to 60 years then compute and display the income tax payable along with the name of tax payer, as per the table given above.

import java.util.Scanner;

public class KboatIncomeTax
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Name: ");
        String name = in.nextLine();
        System.out.print("Enter age: ");
        int age = in.nextInt();
        System.out.print("Enter taxable income: ");
        double ti = in.nextDouble();
        double tax = 0.0;

        if (age > 60) {
            System.out.print("Wrong Category");
        }
        else {
            if (ti <= 250000)
                tax = 0;
            else if (ti <= 500000)
                tax = (ti - 160000) * 10 / 100;
            else if (ti <= 1000000)
                tax = 34000 + ((ti - 500000) * 20 / 100);
            else
                tax = 94000 + ((ti - 1000000) * 30 / 100);
        }
        
        System.out.println("Name: " + name);
        System.out.println("Tax Payable: " + tax);
    }
}
Output
BlueJ output of KboatIncomeTax.java

Question 12

An employee wants to deposit certain sum of money under 'Term Deposit' scheme in Syndicate Bank. The bank has provided the tariff of the scheme, which is given below:

No. of DaysRate of Interest
Up to 180 days5.5%
181 to 364 days7.5%
Exact 365 days9.0%
More than 365 days8.5%

Write a program to calculate the maturity amount taking the sum and number of days as inputs.

import java.util.Scanner;

public class KboatTermDeposit
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter sum of money: ");
        double sum = in.nextDouble();
        System.out.print("Enter number of days: ");
        int days = in.nextInt();
        double interest = 0.0;
        
        if (days <= 180)
            interest = sum * 5.5 / 100.0;
        else if (days <= 364)
            interest = sum * 7.5 / 100.0;
        else if (days == 365)
            interest = sum * 9.0 / 100.0;
        else
            interest = sum * 8.5 / 100.0;
            
        double amt = sum + interest;
        
        System.out.print("Maturity Amount = " + amt);
    }
}
Output
BlueJ output of KboatTermDeposit.java

Question 13

Mr. Kumar is an LIC agent. He offers discount to his policy holders on the annual premium. However, he also gets commission on the sum assured as per the given tariff.

Sum AssuredDiscountCommission
Up to ₹ 1,00,0005%2%
₹ 1,00,001 and up to ₹ 2,00,0008%3%
₹ 2,00,001 and up to ₹ 5,00,00010%5%
More than ₹ 5,00,00015%7.5%

Write a program to input name of the policy holder, the sum assured and first annual premium. Calculate the discount of the policy holder and the commission of the agent. The program displays all the details as:
Name of the policy holder :
Sum assured :
Premium :
Discount on the first premium :
Commission of the agent :

import java.util.Scanner;

public class KboatLICPolicy
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Name: ");
        String name = in.nextLine();
        System.out.print("Enter Sum Assured: ");
        double sum = in.nextDouble();
        System.out.print("Enter First Premium: ");
        double pre = in.nextDouble();
        double disc = 0.0, comm = 0.0;

        if(sum <= 100000){
            disc = pre * 5.0 / 100.0;
            comm = sum * 2.0 / 100.0;
        }
        else if(sum <= 200000){
            disc = pre * 8.0 / 100.0;
            comm = sum * 3.0 / 100.0;
        }
        else if(sum <= 500000){
            disc = pre * 10.0 / 100.0;
            comm = sum * 5.0 / 100.0;
        }
        else{
            disc = pre * 15.0 / 100.0;
            comm = sum * 7.5 / 100.0;
        }

        System.out.println("Name of the policy holder: " + name);
        System.out.println("Sum assured: " + sum);
        System.out.println("Premium: " + pre);
        System.out.println("Discount on the first premium: " + disc);
        System.out.println("Commission of the agent: " + comm);

    }
}
Output
BlueJ output of KboatLICPolicy.java

Question 14

A company announces revised Dearness Allowance (DA) and Special Allowances (SA) for their employees as per the tariff given below:

BasicDearness Allowance (DA)Special Allowance (SA)
Up to ₹ 10,00010%5%
₹ 10,001 - ₹ 20,00012%8%
₹ 20,001 - ₹ 30,00015%10%
₹ 30,001 and above20%12%

Write a program to accept name and Basic Salary (BS) of an employee. Calculate and display gross salary.
Gross Salary = Basic + Dearness Allowance + Special Allowance
Print the information in the given format:
Name    Basic    DA    Spl. Allowance    Gross Salary
  xxx        xxx      xxx            xxx                      xxx

import java.util.Scanner;

public class KboatSalary
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter name: ");
        String name = in.nextLine();
        System.out.print("Enter basic salary: ");
        double bs = in.nextDouble();
        double da = 0.0, sa = 0.0;

        if (bs <= 10000){
            da = bs * 10.0 / 100.0;
            sa = bs * 5.0 / 100.0;
        }
        else if (bs <= 20000){
            da = bs * 12.0 / 100.0;
            sa = bs * 8.0 / 100.0;
        }
        else if (bs <= 30000){
            da = bs * 15.0 / 100.0;
            sa = bs * 10.0 / 100.0;
        }
        else{
            da = bs * 20.0 / 100.0;
            sa = bs * 12.0 / 100.0;
        }
        
        double gs = bs + da + sa;
        System.out.println("Name\tBasic\tDA\tSpl. Allowance\tGross Salary");
        System.out.println(name + "\t" + bs + "\t" + da + "\t" + sa + "\t" + gs);
    }
}
Output
BlueJ output of KboatSalary.java

Question 15

Using a switch case statement, write a menu driven program to convert a given temperature from Fahrenheit to Celsius and vice-versa. For an incorrect choice, an appropriate message should be displayed.
Hint: c = 5/9*(f-32) and f=1.8*c+32

import java.util.Scanner;

public class KboatTemperature
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Type 1 to convert from Fahrenheit to Celsius");
        System.out.println("Type 2 to convert from Celsius to Fahrenheit");
        int choice = in.nextInt();
        double ft = 0.0, ct = 0.0;

        switch (choice) {
            case 1:
                System.out.print("Enter temperature in Fahrenheit: ");
                ft = in.nextDouble();
                ct = 5 / 9.0 * (ft - 32);
                System.out.println("Temperature in Celsius: " + ct);
                break;

            case 2:
                System.out.print("Enter temperature in Celsius: ");
                ct = in.nextDouble();
                ft = 1.8 * ct + 32;
                System.out.println("Temperature in Fahrenheit: " + ft);
                break;

            default:
                System.out.println("Incorrect Choice");
                break;
        }
    }
}
Output
BlueJ output of KboatTemperature.java
BlueJ output of KboatTemperature.java

Question 16

The volume of solids, viz. cuboid, cylinder and cone can be calculated by the formula:

  1. Volume of a cuboid (v = l*b*h)
  2. Volume of a cylinder (v = π*r2*h)
  3. Volume of a cone (v = (1/3)*π*r2*h)

Using a switch case statement, write a program to find the volume of different solids by taking suitable variables and data types.

import java.util.Scanner;

public class KboatMenuVolume
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Volume of cuboid");
        System.out.println("2. Volume of cylinder");
        System.out.println("3. Volume of cone");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();
        
        switch(choice) {
            case 1:
                System.out.print("Enter length of cuboid: ");
                double l = in.nextDouble();
                System.out.print("Enter breadth of cuboid: ");
                double b = in.nextDouble();
                System.out.print("Enter height of cuboid: ");
                double h = in.nextDouble();
                double vol = l * b * h;
                System.out.println("Volume of cuboid = " + vol);
                break;
                
            case 2:
                System.out.print("Enter radius of cylinder: ");
                double rCylinder = in.nextDouble();
                System.out.print("Enter height of cylinder: ");
                double hCylinder = in.nextDouble();
                double vCylinder = (22 / 7.0) * Math.pow(rCylinder, 2) * hCylinder;
                System.out.println("Volume of cylinder = " + vCylinder);
                break;
                
            case 3:
                System.out.print("Enter radius of cone: ");
                double rCone = in.nextDouble();
                System.out.print("Enter height of cone: ");
                double hCone = in.nextDouble();
                double vCone = (1 / 3.0) * (22 / 7.0) * Math.pow(rCone, 2) * hCone;
                System.out.println("Volume of cone = " + vCone);
                break;
                
            default:
                System.out.println("Wrong choice! Please select from 1 or 2 or 3.");
        }
    }
}
Output
BlueJ output of KboatMenuVolume.java
BlueJ output of KboatMenuVolume.java
BlueJ output of KboatMenuVolume.java

Question 17

A Mega Shop has different floors which display varieties of dresses as mentioned
below:

  1. Ground floor : Kids Wear
  2. First floor : Ladies Wear
  3. Second floor : Designer Sarees
  4. Third Floor : Men's Wear

The user enters floor number and gets the information regarding different items of the Mega shop. After shopping, the customer pays the amount at the billing counter and the shopkeeper prints the bill in the given format:

Name of the Shop: City Mart
Total Amount:
Visit Again!!

Write a program to perform the above task as per the user's choice.

import java.util.Scanner;

public class KboatMegaShop
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Ground floor");
        System.out.println("2. First floor");
        System.out.println("3. Second floor");
        System.out.println("4. Third floor");

        System.out.print("Select a floor: ");
        int floor = in.nextInt();

        boolean isFloorValid = true;

        switch (floor) {
            case 1:
                System.out.println("Kids Wear");
                break;
            case 2:
                System.out.println("Ladies Wear");
                break;
            case 3:
                System.out.println("Designer Sarees");
                break;
            case 4:
                System.out.println("Men's Wear");
                break;
            default:
                isFloorValid = false;
                System.out.println("Incorrect Floor");
                break;
        }

        if (isFloorValid) {
            System.out.print("Enter bill amount: ");
            double amt = in.nextDouble();

            System.out.println("Name of the Shop: City Mart");
            System.out.println("Total Amount: " + amt);
            System.out.println("Visit Again!!");
        }
    }
}
Output
BlueJ output of KboatMegaShop.java

Question 18

The equivalent resistance of series and parallel connections of two resistances are given by the formula:

(a) R1 = r1 + r2 (Series)
(b) R2 = (r1 * r2) / (r1 + r2) (Parallel)

Using a switch case statement, write a program to enter the value of r1 and r2. Calculate and display the equivalent resistances accordingly.

import java.util.Scanner;

public class KboatResistance
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Series");
        System.out.println("2. Parallel");
        
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();
        boolean isChoiceValid = true;
        
        System.out.print("Enter r1: ");
        double r1 = in.nextDouble();
        System.out.print("Enter r2: ");
        double r2 = in.nextDouble();
        double eqr = 0.0; 
        
        switch (choice) {
            case 1:
                eqr = r1 + r2;
                break;
            case 2:
                eqr = (r1 * r2) / (r1 + r2);
                break;
            default:
                isChoiceValid = false;
                System.out.println("Incorrect choice");
                break;
        }
        
        if (isChoiceValid)
            System.out.println("Equivalent resistance = " + eqr);
    }
}
Output
BlueJ output of KboatResistance.java
BlueJ output of KboatResistance.java

Question 19

The Simple Interest (SI) and Compound Interest (CI) of a sum (P) for a given time (T) and rate (R) can be calculated as:

(a) SI = (p * r * t) / 100        (b) CI = P * ((1 + (R / 100))T - 1)

Write a program to input sum, rate, time and type of Interest ('S' for Simple Interest and 'C' for Compound Interest). Calculate and display the sum and the interest earned.

import java.util.Scanner;

public class KboatInterest
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the sum: ");
        double p = in.nextDouble();
        System.out.print("Enter rate: ");
        double r = in.nextDouble();
        System.out.print("Enter time: ");
        int t = in.nextInt();
        System.out.println("Enter type of Interest");
        System.out.print("('S'- Simple Interest 'C'- Compound Interest): ");
        char type = in.next().charAt(0);
        boolean isTypeValid = true;

        double interest = 0.0;

        switch (type) {
            case 'S':
            interest = p * r * t / 100;
            break;

            case 'C':
            interest = p * (Math.pow((1 + (r / 100)), t) - 1);
            break;

            default:
            isTypeValid = false;
            System.out.println("Incorrect Interest type");
            break;
        }

        if (isTypeValid) {
            double amt = p + interest;
            System.out.println("Sum = " + p);
            System.out.println("Interest = " + interest);
            System.out.println("Sum + Interest = " + amt);
        }
    }
}
Output
BlueJ output of KboatInterest.java
BlueJ output of KboatInterest.java

Question 20

'Kumar Electronics' has announced the following seasonal discounts on purchase of certain items.

Purchase AmountDiscount on LaptopDiscount on Desktop PC
Up to ₹ 250000.0%5.0%
₹ 25,001 to ₹ 50,0005%7.5%
₹ 50,001 to ₹ 1,00,0007.5%10.0%
More than ₹ 1,00,00010.0%15.0%

Write a program to input name, amount of purchase and the type of purchase (`L' for Laptop and 'D' for Desktop) by a customer. Compute and print the net amount to be paid by a customer along with his name.
(Net amount = Amount of purchase - discount)

import java.util.Scanner;

public class KboatElectronicsSale
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Name: ");
        String name = in.nextLine();
        System.out.print("Enter Amount of Purchase: ");
        double amt = in.nextDouble();
        System.out.println("Enter Type of Purchase");
        System.out.print("'L'- Laptop or 'D'- Desktop: ");
        char type = in.next().charAt(0);
        type = Character.toUpperCase(type);
        double disc = 0.0;
        
        if (amt <= 25000)
            disc = type == 'L' ? 0.0 : 5.0;
        else if (amt <= 50000)
            disc = type == 'L' ? 5.0 : 7.0;
        else if (amt <= 100000)
            disc = type == 'L' ? 7.5 : 10.0;
        else
            disc = type == 'L' ? 10.0 : 15.0;
            
        double netAmt = amt - (disc * amt / 100);
        
        System.out.println("Name: " + name);
        System.out.println("Net Amount: " + netAmt);
    }
}
Output
BlueJ output of KboatElectronicsSale.java

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