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Thread: Funky triple nested loop problem. (Due tonight)(Confusing)

  1. #1
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    Default Funky triple nested loop problem. (Due tonight)(Confusing)

    I have this assignment that's due tonight at midnight, but I have completed all but 1 part. The second triangle, I am having problems grasping the concept of nested loops I believe, but it's part of it. Anyways, here is question then code.

    Write a Java program that reads positive integer n, 1 ≤ n ≤ 13, and plots 3 triangles of size n as shown below.

    For n = 4, for instance, the program should plot: (works for n = 5 and n = 6 etc.)



    triangle 1

    1

    2 3

    4 5 6

    7 8 9 10



    triangle 2

    _ _ _ 1

    _ _ 3 2

    _ 6 5 4

    10 9 8 7



    triangle 3

    _ _ _ 1

    _ _ 3 3 3

    _ 5 5 5 5 5

    7 7 7 7 7 7 7

    import java.util.Scanner;
    class Loops {
     
     
        void plotTriangle1(int n) {
            int t = 1;
            for (int i = 1; i <= n; i++) {
                System.out.println(" ");
                for (int j = 1; j <= i; j++) {
                    System.out.printf("%3d", t++);
     
                }
                System.out.println();
            }
        }
     
        void plotTriangle2(int n) {
            int t = 1;
            for (int i = 1; i <= n; i++) {
     
                for (int k = 1; k <= i; k++) {
     
                }
                for (int j = 1; j <= i; j++) {
     
                    System.out.printf("%3d",t++);
     
                }
                System.out.println();        
            }
     
     
        } 
     
     
        void plotTriangle3(int n) {
     
            for (int i = 1; i <= n; i++) {
                System.out.println(); 
                for(int j = 1;j <= (n-i);j++) {
                    System.out.print("   ");
                }
                for (int j = 1; j <= 2*i-1; j++) { 
                    System.out.print(" "); 
                    System.out.printf("%3d",2*i-1);
                }
                System.out.println();
            }
        }   
    }
     
    public class Lab7 {
     
        public static void main(String[] args) {
            Scanner in = new Scanner(System.in);  
            Loops myL = new Loops();
     
            int n;
     
            System.out.print("Enter n(1-13):");
            n = in.nextInt();
     
            //myL.plotTriangle1(n);
            myL.plotTriangle2(n);
            //myL.plotTriangle3(n);
     
        }
     
    }

    Currently compiles to this: Enter n(1-13):4
    1
    2 3
    4 5 6
    7 8 9 10

    --- Update ---

    Sorry for the question format of the triangles, I couldnt get the spacing to work so I used underscores to replicate the blank space on the forum. Thanks.
    Last edited by goodtanner; October 10th, 2014 at 06:27 PM. Reason: showing compile


  2. #2
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    Default Re: Funky triple nested loop problem. (Due tonight)(Confusing)

    What problems are you having getting the program to work? Do you have any specific questions?

    NOTE: Put the output in code tags to preserve its formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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