C语言:在屏幕上输出图案

在屏幕上输出以下图案：
*

---

---

---

---

---

---

---

---

---

---

---

行数	星数
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	11
9	9
10	7
11	5
12	3
13	1

观察行数与星数,设行数为n,星数为s,前七行递增满足:s=2n-1,后六行递减满足s=11-2*(n-7)

#include<stdio.h>
int main(){
	int n;
	int s;
	for (n = 1; n <= 7; n++){//前七行星数递增
		for (s = 1; s <= 2 * n - 1; s++){//星数每次加2
			printf("*");

		}printf("\n");
	}
	for (n = 7; n <= 13;n++){//从第八行开始后六行星数递减
		for (s = 1; s <= 11 - 2 * (n - 7); s++){//星数每次减2
			printf("*");
		}
		printf("\n");
	}
	system("pause");
	return 0;

}