Java program to print Floyd's Triangle.

Source:

class FloydTriangle {
   public static void main(String args[]) {

      int rows = 7;  
      int n = 1;
      int c; 
      int d;

      System.out.println("Floyd's triangle:");
 
      for ( c = 1 ; c <= rows ; c++ ) {
         for ( d = 1 ; d <= c ; d++ ) {
            System.out.print(n + " ");
            n++;
         }
         System.out.println();
      }
   }
}

Output:

   $ java FloydTriangle
   Floyd's triangle:
   1 
   2 3 
   4 5 6 
   7 8 9 10 
   11 12 13 14 15 
   16 17 18 19 20 21 
   22 23 24 25 26 27 28