给出某年某月，某日，求出这天是星期几的一个c语言代码

以下是一个C语言代码，可以计算某年某月某日是星期几：

#include <stdio.h>

int main()
{
    int year, month, day;
    printf("请输入年份：");
    scanf("%d", &year);
    printf("请输入月份：");
    scanf("%d", &month);
    printf("请输入日期：");
    scanf("%d", &day);

    int century = year / 100;
    int year_of_century = year % 100;

    int week = (day + (26 * (month + 1)) / 10 + year_of_century + year_of_century / 4 + century / 4 + 5 * century) % 7;

    switch (week)
    {
    case 0:
        printf("%d年%d月%d日是星期日\n", year, month, day);
        break;
    case 1:
        printf("%d年%d月%d日是星期一\n", year, month, day);
        break;
    case 2:
        printf("%d年%d月%d日是星期二\n", year, month, day);
        break;
    case 3:
        printf("%d年%d月%d日是星期三\n", year, month, day);
        break;
    case 4:
        printf("%d年%d月%d日是星期四\n", year, month, day);
        break;
    case 5:
        printf("%d年%d月%d日是星期五\n", year, month, day);
        break;
    case 6:
        printf("%d年%d月%d日是星期六\n", year, month, day);
        break;
    }

    return 0;
}