【C语言】计算指定日期是一年中第几天

秒速五厘米 2022-06-12 05:27 338阅读 0赞

/* * 输入年月日，计算这的这年的第几天 * */
    #include <stdio.h>
    /*************************************************************** * 闰年判断 * *************************************************************/
    int year_rn(int year) {
    // printf("%d\n",year);
        if(year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) {
            return 1;
        }        
    }
    /**************************************************************** * 该月前天数判断 * **************************************************************/
    int mouth_sum(int mouth) {
        switch(mouth){
            case 1 : return 0;
            case 2 : return 31;
            case 3 : return 59;
            case 4 : return 90;
            case 5 : return 120;
            case 6 : return 151;
            case 7 : return 181;
            case 8 : return 212;
            case 9 : return 243;
            case 10 : return 273;
            case 11 : return 304;
            case 12 : return 334;
        }
    }
    
    int main() {
        int year = 0, mouth = 0, day = 0, sign_rn = 0, mou_sum = 0, sum = 0;
        printf("请输入年，月，日：\n");
        scanf("%d%d%d", &year, &mouth, &day);
        sign_rn = year_rn(year);
    // if(sign_rn == 1) { 
    // printf("%d是闰年", year);
    // }
    
        mou_sum = mouth_sum(mouth);
        if(sign_rn == 1 && mouth > 2) {
            mou_sum = mou_sum + 1;
        }
        else {
            mou_sum = mou_sum;
        }
    // printf("%d月前有%d天\n", mouth, mou_sum);
    
        sum = mou_sum + day;
        printf("%d年%d月%d日在今年是第%d天", year, mouth, day, sum);
        return 0;
    }