月末日取得【C】 - Wizard

指定年月の月末の日付を返却します。

#define TRUE   0
#define FALSE -1

/* is leap or not */
int IsLeapYear(int year)
{
    if (((year % 4 == 0) && (year % 100 != 0)) || year % 400 == 0) {
        return TRUE;
    } else {
        return FALSE;
    }
}

/* get the last day of month */
int GetLastDay(int year, int month)
{
    int leap;
    int lmdays[] = {31,29,31,30,31,30,31,31,30,31,30,31};
    int mdays[]  = {31,28,31,30,31,30,31,31,30,31,30,31};

    leap =  = IsLeapYear(year);
    // leap year
    if (leap == TRUE) {
        return lmdays[month - 1];
    // no_leap year
    } else {
        return mdays[month - 1];
    }
}