/*文件名:exam10_12.cpp*/
#include <stdio.h>
main()
{
	int n;
	enum {sun,mon,tue,wed,thu,fri,sat} day;
	char weekday[7][7]={"星期天","星期一","星期二","星期三",
		"星期四","星期五","星期六"};
	printf("輸入間隔天數:");
	scanf("%d",&n);
	day=sun;
	printf("今天是%s,%d天后是%s.\n",weekday[day],n,weekday[(day+n)%7]);
}