Thread: for loop problem

I need help in this java prob

• Prompt user for new height of the triangle after the result was printed out
• User can terminate the program by entering number, 0 and below

/* Output
Enter height of triangle: 3
1 2 3
1 2
1
Enter height of triangle: 2
1 2
1
Enter height of triangle: -1
*/

Attached is my incomplete program

import java.util.*;
 
public class Triangle {
	public static void main (String[]args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("Enter the height of triangle: ");
		int height = sc.nextInt();
 
		for (int num=height; num>0; num--) {
			for (int dispNum=0; dispNum<num; dispNum++) {	
				System.out.print(dispNum+1 +" ");
			}
                        System.out.print("\n");
		}
	}
}

What part do you need help with? Are you getting incorrect outputs? If so, what is wrong about them?

One thing I can see right away is that you're not looping your program. My recommendation is to create a helper function which can print out a triangle given an integer height. Then in your main method use a while loop which repeatedly asks for the user to input a height. If the height is greater than 0, draw the triangle and continue the while loop. Otherwise, terminate the loop to exit the program.

The following control statement might be useful:
The while and do-while Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)