经典C语言源代码
1、(1)某年某月某日是星期几
#include<stdio.h>
int main()
{int year, month, day;
while (scanf_s("%d%d%d", &year, &month, &day) != EOF)
{if (month == 1 || month == 2)//判断month是否为1或2　
{year--;
month += 12;
}int c = year / 100;
int y = year - c * 100;
int week = (c / 4) - 2 * c + (y + y / 4) + (13 * (month + 1) / 5) + day - 1;
while (week<0) { week += 7; }
week %= 7;
switch (week)
{case 1:printf("Monday\n"); break;
case 2:printf("Tuesday\n"); break;
case 3:printf("Wednesday\n"); break;
case 4:printf("T ...