SWUSTOJ #78 计算生日是星期几

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题目

编写一个程序，只要输入年月日，就能回答那天是星期几。
能被4整除但不能被100整除的，或者能被400整除的是闰年。

输入

输入一个日期，包括年、月、日。(一组测试数据)

输出

输出这个日期是星期几。

样例输入

1 1 1
2 1 1
2006 7 10

样例输出

Monday
Tuesday
Monday

源代码

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int year, month, day;
    int yd, md; // 定义年份和月份代码
    int dh; // 定义dh为代码和
    int xin;
    scanf("%d%d%d", &year, &month, &day);
    int yushu1, yushu2;
    yd = ((year%100)/4 + (year%100))%7;
    yushu1 = year%4;
    yushu2 = year%100;
    if(yushu1 = 0 && yushu2 != 0) // 能被4整除不能被100整除是闰年
    {
        if(month == 1)
        {
            md = 5;
        }
        if(month == 2)
        {
            md = 1;
        }
        if(month == 3)
        {
            md = 2;
        }
        if(month == 4)
        {
            md = 5;
        }
        if(month == 5)
        {
            md = 0;
        }
        if(month == 6)
        {
            md = 3;
        }
        if(month == 7)
        {
            md = 5;
        }
        if(month == 8)
        {
            md = 1;
        }
        if(month == 9)
        {
            md = 4;
        }
        if(month == 10)
        {
            md = 6;
        }
        if(month == 11)
        {
            md = 2;
        }
        if(month == 12)
        {
            md = 4;
        }
        xin = (day+md+yd)%7;
        switch(xin)
        {
            case 1:printf("Monday\n");
            break;
            case 2:printf("Tuesday\n");
            break;
            case 3:printf("Wednesday\n");
            break;
            case 4:printf("Thursday\n");
            break;
            case 5:printf("Friday\n");
            break;
            case 6:printf("Saturday\n");
            break;
            case 7:printf("Sunday\n");
            break;
        }
    }
    else
    {
        if(month == 1)
        {
            md = 6;
        }
        if(month == 2)
        {
            md = 2;
        }
        if(month == 3)
        {
            md = 2;
        }
        if(month == 4)
        {
            md = 5;
        }
        if(month == 5)
        {
            md = 0;
        }
        if(month == 6)
        {
            md = 3;
        }
        if(month == 7)
        {
            md = 5;
        }
        if(month == 8)
        {
            md = 1;
        }
        if(month == 9)
        {
            md = 4;
        }
        if(month == 10)
        {
            md = 6;
        }
        if(month == 11)
        {
            md = 2;
        }
        if(month == 12)
        {
            md = 4;
        }
        xin = (day+md+yd) % 7;
        switch(xin)
        {
            case 1:printf("Monday\n");
            break;
            case 2:printf("Tuesday\n");
            break;
            case 3:printf("Wednesday\n");
            break;
            case 4:printf("Thursday\n");
            break;
            case 5:printf("Friday\n");
            break;
            case 6:printf("Saturday\n");
            break;
            case 7:printf("Sunday\n");
            break;
    	}
    }
    return 0;
}