To Check whether a year is Leap or Not

#include <stdio.h>

int main(int argc, char * argv[]) {
   int year;
   if(argc!=2)
   {
       printf("\nArgument not in Correct Format\n");
       exit(0);
   }
   year=atoi(argv[1]);
   if (((year % 4 == 0) && (year % 100!= 0)) || (year%400 == 0))
      printf("\n%d is a leap year\n", year);
   else
      printf("\n%d is not a leap year\n", year);

   return 0;
}

Output: