Question

How to check leap year in C

Answer 1

#include <stdio.h>
 
int main(int argc, char **argv)
{
    int year;
 
    printf("Enter a year: ");
    scanf("%d", &year);
 
    if (year % 400 == 0)
        printf("%d is a leap year.\n", year);
    else if (year % 100 == 0)
             printf("%d is not a leap year.\n", year);    
         else if (year % 4 == 0)
                  printf("%d is a leap year.\n", year);
              else
                  printf("%d is not a leap year.\n", year);
    
    return(0);
}




/*
run:

Enter a year: 2016
2016 is a leap year.

*/

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Answer 2

#include <stdio.h>
#include <stdbool.h>


_Bool isLeapYear(int year);

int main(int argc, char **argv) 
{ 
    int years[] = {2000, 2400, 1800, 1900, 2100, 2200, 2300, 2500,
                   2008, 2012, 2016, 2020, 2024, 2048, 2032};
    
    for (int i = 0; i < sizeof(years)/sizeof(years[0]); i++)
    {
        if (isLeapYear(years[i]))
            printf("%d is a leap year.\n", years[i]);
        else
            printf("%d is not a leap year.\n", years[i]);
    }
    
    return(0);
}

_Bool isLeapYear(int year) 
{
    if (year % 400 == 0)
        return true;
    else if (year % 100 == 0)
             return false;
    else if (year % 4 == 0)
             return true;
    
    return false;
}


/*
run:

2000 is a leap year.
2400 is a leap year.
1800 is not a leap year.
1900 is not a leap year.
2100 is not a leap year.
2200 is not a leap year.
2300 is not a leap year.
2500 is not a leap year.
2008 is a leap year.
2012 is a leap year.
2016 is a leap year.
2020 is a leap year.
2024 is a leap year.
2048 is a leap year.
2032 is a leap year.

*/

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