程序代码：

#include <stdio.h>

int main (void)
{
    int width;
    int heighth;
    int y;
    int x;
   
    printf("Please input WIDTH:");
    scanf("%d", &width);
    printf("Please input HEIGHTH:");
    scanf("%d", &heighth);
   
    for (y = 1; y <= heighth; y++)
    {
        for (x = 1; x <= width; x++)
        {
            if (x-1==0 || x-width==0 || y-1==0 || y-heighth==0)
                printf("%-2c", '*');
            else
                printf("%-2c", ' ');
        }
        printf("\n");
    }

    return 0;
}