题解 | #空心正方形图案#

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