A program to generate a Triangle.

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class CreateTriangle{

      public static void main(String args[]){

          int num = Integer.parseInt(args[0]);

          for(int i=1;i<=num;i++){

             for(int j=1;j<=i;j++){

                System.out.print(" "+i+" ");

             }

             System.out.print("\n");

           } 

    }

}