题解 | #空心正方形图案#

#include <stdio.h>

int main()
{
    int n = 0;
    int i = 0;
    int j = 0;
    while (scanf("%d", &n) != EOF)
    {
        for (i = 0; i < n; i++)
        {
            for (j = 0; j < n; j++)
            {
                if ((0 == i) || (0 == j) || (j == n - 1) || (i == n - 1))
                {
                    printf("* ");
                }
                else
                {
                    printf("  ");
                }
            }
            printf("\n");
        }
    }
    return 0;
}