题解 | #空心正方形图案#

#include<stdio.h>
int main()
{
    int c, r, n;
    while (scanf("%d", &n) != EOF)
    {
        for (r = 1; r <= n ;r++)
        {
            for (c = 1; c <= n; c++)
            {
                if (r == 1 || r == n || c == 1 || c == n)
                    printf("%-2c", '*');
                 else
                 printf("  ");
            
            }
            printf("\n");
        }
    }
      return 0;
}