Alternate Number Pyramid

Q. Write a C program to print the following double number pyramid as:

1222
2122
2212
2221

Ans.

/*c program for alternate number pyramid*/
#include<stdio.h>
int main()
{
 int r,c,num=4;
 for(r=1; r<=num; r++)
 {
  for(c=1; c<=num; c++)