#include <stdio.h>
int main(void)
{
int n;//正方形边的长度
int a=1,b,c;
printf("Please enter the number of squares:");
scanf("%d",&n);
while(a<=n){
if(a==1||a==n){
b=1;
while(b<=n){
printf("*");
b++;
}
}
if(a<n&&a>1){
b=1;
while(b<=n){
if(b==1||b==n){
printf("*");
}
if(b<n&&b>1){
printf(" ");
}
b++;
}
}
printf("\n");
a++;
}
return 0;
}