Question

C programming

Write a function that is passed a month, day, and year and will determine if that date is valid. You can assume each parameter is passed in as an integer. Remember to check for leap year!

validDate (5, 31, 1961) .... would be valid

validDate (13, 4, 1967) ... would be invalid, the month is invalid

Answer 1

#include <stdio.h>

int validDate(int day, int month, int year) {
    int is_leap = (year % 4 == 0) && (year % 400 == 0 || year % 100 != 0);
    if (year < 0 || month < 1 || month > 12) {
        return 0;
    } else {
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
            return day >= 1 && day <= 31;
        } else if (month == 2) {
            if (is_leap) {
                return day >= 1 && day <= 29;
            } else {
                return day >= 1 && day <= 28;
            }
        } else {
            return day >= 1 && day <= 30;
        }
    }
}

int main() {
    printf("%d\n", validDate(5, 31, 1961));
    printf("%d\n", validDate(13, 4, 1967));
    return 0;
}