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Java Pattern Programs

Using the switch statement, write a menu driven program for the following:

(a) To print the Floyd's triangle:
1
2   3
4   5   6
7   8   9   10
11 12 13 14 15

(b) To display the following pattern:
I
I C
I C S
I C S E

For an incorrect option, an appropriate error message should be displayed.

Java

Java Nested for Loops

ICSE

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Answer

import java.util.Scanner;

public class KboatPattern
{
    public void choosePattern() {
        Scanner in = new Scanner(System.in);
        System.out.println("Type 1 for Floyd's triangle");
        System.out.println("Type 2 for an ICSE pattern");
        
        System.out.print("Enter your choice: ");
        int ch = in.nextInt();
        
        switch (ch) {
            case 1:
            int a = 1;
            for (int i = 1; i <= 5; i++) {
                for (int j = 1; j <= i; j++) {
                    System.out.print(a++ + "\t");
                }
                System.out.println();
            }
            break;
            
            case 2:
            String s = "ICSE";
            for (int i = 0; i < s.length(); i++) {
                for (int j = 0; j <= i; j++) {
                    System.out.print(s.charAt(j) + " ");
                }
                System.out.println();
            }
            break;
            
            default:
            System.out.println("Incorrect Choice");
        }
    }
}

Output

BlueJ output of Using the switch statement, write a menu driven program for the following: (a) To print the Floyd's triangle: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 (b) To display the following pattern: I I C I C S I C S E For an incorrect option, an appropriate error message should be displayed.BlueJ output of Using the switch statement, write a menu driven program for the following: (a) To print the Floyd's triangle: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 (b) To display the following pattern: I I C I C S I C S E For an incorrect option, an appropriate error message should be displayed.

Answered By

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