题解 | #空心正方形图案#

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

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