空心菱形(一个循环）

代码

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

int n;

void init() {
	printf("请输入n：");
	scanf("%d", &n);
}

void output() {
	int spot = 0;
	int linecount = 0;
	int midLine = n / 2;
	int pos_1 = midLine;
	int pos_2 = 2 * midLine - pos_1;
	while (linecount < n) {
		if (spot == pos_1) {
			if (pos_1 != pos_2) {
				printf("*");
				spot++;
			}
			else {
				printf("*");
				linecount++;
				spot = 0;
				pos_1 = linecount > midLine ? pos_1 + 1 : pos_1 - 1;
				pos_2 = 2 * midLine - pos_1;
				printf("\n");
			}
		}
		if (spot == pos_2) {
			printf("*");
			linecount++;
			spot = 0;
			pos_1 = linecount > midLine ? pos_1 + 1 : pos_1 - 1;
			pos_2 = 2 * midLine - pos_1; 
			printf("\n");
		}
		else {
			printf(" ");
			spot++;
		}
	}
}

int main() {
	init();
	output();
	return 0;
}