e.g 1. 打印星期

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
	int day = 0;
	scanf("%d", &day);
	switch (day)
	{
	case 1:
		printf("星期1\n");
		break;

	case 2:
		printf("星期2\n");
		break;

	case 3:
		printf("星期3\n");
		break;

	case 4:
		printf("星期4\n");
		break;

	case 5:
		printf("星期5\n");
		break;

	case 6:
		printf("星期6\n");
		break;

	case 7:
		printf("星期天\n");
		break;
	default:
		printf("输入错误\n");
		break;
	}
		return 0;
}

注：switch可嵌套，要写break，每个break意味跳出此部分