自定义行数输出空心菱形

#include <stdio.h>
#include <math.h>

int main()
{
	int i, j, t, m, n;
	printf("输入行数n=:\n");
	scanf("%d", &n);
	m = (n - 1) / 2;
	for (j = m; j >= m; j--)
	{
		t = (m - fabs(j));
		for (i = 0; i < m - t; i++)
		{
			printf(" ");
		}
		printf("*");
		if (t == 0)
		{
			printf("\n");
			continue;
		}
		for (; i < m - 1 + t; i++)
		{
			printf(" ");
		}
		printf("*");
		printf("\n");
	}
	return 0;
}