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Thread: for loop problem

  1. #1
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    Default 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");
    		}
    	}
    }
    Last edited by helloworld922; October 8th, 2011 at 12:42 PM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: for loop problem

    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.

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    javaneedhelp (October 8th, 2011)

  4. #3
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    Default Re: for loop problem

    i need help in shifting the prompting inside the loop.

    it will be great if explanation can be provided!

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    Super Moderator copeg's Avatar
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    Default Re: for loop problem

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

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