题解 | #空心正方形图案#

#include <stdio.h>

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