GyRZ5Y - Online C Compiler & Debugging Tool

#include <stdio.h>


int Leap(int year) {
    if (year % 400 == 0) return 1;
    else if (year % 100 == 0) return 0;
    else if (year % 4 == 0) return 1;
    else return 0;
}


int DayMonth(int year, int month) {
    if (month == 2) {
        if (Leap(year))
            return 29;
        else
            return 28;
    } else if (month == 4 || month == 6 || month == 9 || month == 11) {
        return 30;
    } else {
        return 31;
    }
}


int main() {
    int year, month;

    printf("西暦年を入力してください: ");
    scanf("%d", &year);

    printf("月を入力してください: ");
    scanf("%d", &month);

    if (month < 1 || month > 12) {
        printf("月の値が不正です。\n");
        return 1;
    }

    int days = DayMonth(year, month);
    printf("%d年%d月の日数は %d 日です。\n", year, month, days);

    return 0;
}