Question

import java.util.Scanner;
public class DrawTriangle
{
    public static void main(String[] args)
    {
    Scanner scan = new Scanner(System.in);
    System.out.println("Enter a height");
    while (!scan.hasNextInt()) // while non-integers are present
    {
        scan.next();
        System.out.println ("Bad input. Enter an integer.");
    }
    int input = scan.nextInt();
    for (int x = 1; x <= input; x++)
    {
        for (int y = 0; y < input; y++)
        {
            System.out.print(" ");

            for (int z = 1; z < y; z++)
            {
                System.out.print("x");
            }

            System.out.println();
        }
    }
}

}

I have to make a triangle of x’s relating to the height specified by the user. Can’t get it to work at all, any help would be appreciated.
Thanks!

Sorry should have clarified
I need it to look like this –

   x
  xxx
 xxxxx

Answer 1

You don’t need nested loop upto 3 levels. Just 2 levels are needed. One for traversing along columns, and one for traversing along rows.

So, change your loop to: –

    for (int x = 1; x <= input; x++)
    {
        for (int y = 0; y < x; y++)
        {
            System.out.print("x ");
        }
        System.out.println();
    }

UPDATE : –

For equilateral triangle, you would need to add one more loop to print spaces before x on the starting rows. Here’s the code: –

    for (int x = 1; x <= input; x++)
    {
        for (int y = 0; y < input - x; y++) {
            System.out.print(" ");
        }
        for (int y = 0; y < x; y++) {
            System.out.print("x ");
        }
        System.out.println();
    }