// Description: Program that determines if the input year is a leap year
// Activity Section: 1.Design with Functions
// Date: 10/3/15
// by Sabrina Rispin

// Test Cases: year - expected result - pass/fail
// 1 - assert error - pass
// 1583 - not l.y.  - pass
// 1584 - l.y.      - pass
// 1700 - not l.y.  - pass
// 1600 - l.y.      - pass
// 2000 - l.y.      - pass
// 2100 - not l.y.  - pass
//---------------------------72-characters------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#define START_OF_GREG_CAL 1582

int isLeapYear (int year);

int main (int argc, char * argv[]) {
   int year;

   printf("please enter the year you are interested in\n");
   scanf("%d", &year);

   if (isLeapYear(year)) {
      printf("%d is a leap year!\n", year);
   } else {
      printf("%d is not a leap year!\n", year);
   }

   return EXIT_SUCCESS;
}

int isLeapYear (int y) {
   assert(y >= START_OF_GREG_CAL);
   int isleap = 0;

   if (y % 400 == 0) {
      isleap = 1;
   } else if (y % 100 == 0) {
      isleap = 0;
   } else if (y % 4 == 0) {
      isleap = 1;
   }

   return isleap;
}

Download file: leapYearFunction.c (1.1 KB)

Sabrina Rispin – edited Tue, Mar 10 2015 1:22 p.m. – history