#include <stdio.h>
 
int main(void)
{
    int day;
    const char *week[] = {
        "星期一", "星期二", "星期三", "星期四",
        "星期五", "星期六", "星期日"
    };
 
    printf("请输入整数(1-7): ");
    if (scanf("%d", &day) != 1) {
        printf("输入无效！\n");
        return 1;
    }
 
    if (day >= 1 && day <= 7)
        printf("%s\n", week[day - 1]);   /* 下标从 0 开始，故减 1 */
    else
        printf("输入错误，请输入 1~7 的整数。\n");
 
    return 0;
}

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Nw==

7