Question

Why is it the output enters new line after 3? like this:

9

8 7

6 5 4

3

2 1

any number i input it always enters a new line after 3. My target output should be like this when i input 9:

9

8 7

6 5 4

3 2 1 0

Will you please clarify to me why is it enters a new line after 3?

public class TriangleWithInput {

/**
 * @param args
 */
@SuppressWarnings("resource")
public static void main(String[] args) {
    // TODO Auto-generated method stub

    Scanner sc = new Scanner(System.in);

    System.out.print("Enter a number: ");
    int input = sc.nextInt();

    while (input >= 0) {
        int c = 1;
        while ( c <= input) {
            int r = 1;
            while (r <= c) {
                System.out.print(input + " ");
                input--;
                r++;
            }
            System.out.println();
            c++;
        }
    }
}

}

Answer 1

You seem to have one too many nested loops. You are getting a new line because of the test c <= input; when input reaches 3 and c >= 3, you do a line break and reset c to 1.

I’d write your loops like this:

for (int r = 1; input >= 0; ++r) {
    for (int c = 1; c <= r && input >= 0; ++c, --input) {
        System.out.print(input + " ");
    }
    System.out.println();
}