Write a java code to print following pattern

A
BB
CCC
DDDD


Solution:

class printABCD
{
     public static void main(String abc[])
     {
        int alphabet=65;                          //ASCII value of A
        for(int i=1;i<5;i++)
        {
            for(int j=1;j<=i;j++)
              {
                System.out.print((char)alphabet);
              }
                System.out.println();
                alphabet++;
         }
     }
}