程序代码：

#include"stdio.h"


char *day_name(int n)
{
    char *name[100]={"illegal day!!","monday","tuesday","wensday","thyursday","friday","satday","sunday"};
    if(n>0&&n<8) return name[n];
    else
        return name[0];

}
void main()
{
    int n;
    printf("请输入一个整数:");
    scanf("%d",&n);
    printf("    这天是%s\n",*day_name(n));
}