我这里是可以运行的。

#include <stdio.h>

char* weekname(char *p[], int n); 

int main()

{

        char* week[7]={"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};

        int n;

        printf ("Please input a digital:\n");

        scanf ("%d", &n);

        if (n>=1 && n<=7) {

                printf ("星期%d的英文名是%s\n", n, weekname(week, n));

        } else{

                 printf ("The digital is invalid\n");

        }

        return 0;

 }

char* weekname(char *p[], int n)

{

        return *(p+n-1);

}