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#include <stdio.h>
 
int main(void) {
	int N,num=0,count=0,n;
	scanf("%d",&N);
	for(i=0;i<N;i++)
	{
	    printf(" \n");
	    for(j=0;j<=i;j++)
	    {
	        n=(i+j+1)*2;
	        num=n*(2*n-1);
	        while(num!=0)
	        {
	            num=num/10;
	            ++count;
	        }
	        if(count<5)
	        {
	            printf("%05d\n",num);
	        }
 
	    }
	}
	return 0;
}

prog.c: In function ‘main’:
prog.c:6:6: error: ‘i’ undeclared (first use in this function)
  for(i=0;i<N;i++)
      ^
prog.c:6:6: note: each undeclared identifier is reported only once for each function it appears in
prog.c:9:10: error: ‘j’ undeclared (first use in this function)
      for(j=0;j<=i;j++)
          ^

Standard output is empty