How to make continuous number pyramid with Zero

Q. Write a C program to make a continuous number pyramid with adding digit "Zero" as:

  1
  02
  003
  0004
  00005
  000006
  0000007
  00000008
  000000009

Ans.

/*c program for making a continuous number pyramid*/
#include<stdio.h>
int main()
{
 int r,c;