## Computer Science

An Evil number is a positive whole number which has even number of 1's in its binary equivalent. Example: Binary equivalent of 9 is 1001, which contains even number of 1's. A few evil numbers are 3, 5, 6, 9…. Design a program to accept a positive whole number and find the binary equivalent of the number and count the number of 1's in it and display whether it is a Evil number or not with an appropriate message. Output the result in format given below:

Example 1

Input: 15

Binary Equivalent: 1111

No. of 1's: 4

Output: Evil Number

Example 2

Input: 26

Binary Equivalent: 11010

No. of 1's: 3

Output: Not an Evil Number

#### Java

#### Java Iterative Stmts

#### ICSE

22 Likes

### Answer

```
import java.util.Scanner;
public class KboatEvilNumber
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter a positive number: ");
int n = in.nextInt();
if (n < 0) {
System.out.println("Invalid Input");
return;
}
int count = 0;
int p = 0;
int binNum = 0;
while (n > 0) {
int d = n % 2;
if (d == 1)
count++;
binNum += (int)(d * Math.pow(10, p));
p++;
n /= 2;
}
System.out.println("Binary Equivalent: " + binNum);
System.out.println("No. of 1's: " + count);
if (count % 2 == 0)
System.out.println("Output: Evil Number");
else
System.out.println("Output: Not an Evil Number");
}
}
```

### Output

Answered By

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## Related Questions

A number is said to Bouncy number if the digits of the number are unsorted.

For example,

22344 - It is not a Bouncy number because the digits are sorted in ascending order.

774410 - It is not a Bouncy number because the digits are sorted in descending order.

155349 - It is a Bouncy number because the digits are unsorted.

A number below 100 can never be a Bouncy number.Write a program in java to accept a number. Check and display whether it is a Bouncy number or not.

Given two positive numbers M and N, such that M is between 100 and 10000 and N is less than 100. Find the smallest integer that is greater than M and whose digits add up to N. For example, if M = 100 and N = 11, then the smallest integer greater than 100 whose digits add up to 11 is 119.

Write a program to accept the numbers M and N from the user and print the smallest required number whose sum of the digits is equal to N. Also, print the total number of digits present in the required number. The program should check for the validity of the inputs and display an appropriate message for an invalid input. Test your program with the sample data and some random data:

Example 1 Example 2 Input:

M = 100

N = 11Input:

M = 1500

N = 25Output:

The required number = 119

Total number of digits = 3Output:

The required number = 1699

Total number of digits = 4Example 3 Example 4 Input:

M = 99

N = 11Input:

M = 112

N = 130Output:

Invalid InputOutput:

Invalid InputA Composite Magic number is a positive integer which is composite as well as a magic number.

Composite number: A composite number is a number which has more than two factors.

For example:

Factors of 10 are: 1, 2, 5, 10Magic number: A Magic number is a number in which the eventual sum of the digit is equal to 1.

For example: 28 = 2+8=10= 1+0=1Accept two positive integers 'm' and 'n', where m is less than n. Display the number of composite magic integers that are in the range between m and n (both inclusive) and output them along with frequency, in the format specified below:

Sample Input:

m=10 n=100

Output: The composite magic numbers are 10,28,46,55,64,82,91,100

Frequency of composite magic numbers: 8Sample Input:

m=120 n=90

Output: Invalid inputWrite a Program in Java to input a number and check whether it is a Pronic Number or Heteromecic Number or not.

Pronic Number: A Pronic number, oblong number, rectangular number or heteromecic number, is a number which is the product of two consecutive integers, that is, n (n + 1).

The first few Pronic numbers are:

0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462 … etc.