Java Pyramid of Numbers

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Java Pyramid of Numbers

Hi, I want to know how the code to print the pyramid below works. It uses nested for loops.

Pyramid:

                                          1
                                        2 1 2
                                      3 2 1 2 3
                                    4 3 2 1 2 3 4
                                  5 4 3 2 1 2 3 4 5
                                6 5 4 3 2 1 2 3 4 5 6
                              7 6 5 4 3 2 1 2 3 4 5 6 7
                            8 7 6 5 4 3 2 1 2 3 4 5 6 7 8
                          9 8 7 6 5 4 3 2 1 2 3 4 5 6 7 8 9
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February 11, 2011 at 12:41 PM

Java Pyramid of Numbers

class Pyramid{
    public static void main(String[] args){
     int x = 9;  
     for (int i = 1; i <= x; i++) {  
     for (int j = 1; j <= x - i; j++)  
     System.out.print("   ");  
     for (int k = i; k >= 1; k--)  
     System.out.print((k >=10) ?+ k : "  " + k);  
     for (int k = 2; k <=i; k++)  
     System.out.print((k>= 10) ?+ k : "  " + k);  
     System.out.println();  
    }  
  }
}

February 11, 2011 at 8:35 PM

Thank you. But I keep don't understanding how the spaces between numbers are working


February 11, 2012 at 12:47 AM

instead of using System.out.print with conditional, you could do this: this will allocate five spaces for the numbers.

class Pyramid{
    public static void main(String[] args){
     int x = 9;  
     for (int i = 1; i <= x; i++) {  
     for (int j = 1; j <= x - i; j++)  
     System.out.printf("%5s", "");  
     for (int k = i; k >= 1; k--)  
     System.out.printf("%5d", k);  
     for (int k = 2; k <=i; k++)  
     System.out.printf("%5d", k);  
     System.out.println();  
    }  
  }
}

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