题解 | #空心正方形图案#

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

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