C: print the diamond

题目链接：菱形图案

#include<stdio.h>
int main()
{
    
	//多组输入
	int n = 0;
	while ((scanf("%d", &n) != EOF))
	{
    
		int i = 0;
		int j = 0;
		
		//triangle above
		for (i = 0;i < n;i++)
		{
    
			for (j = 0;j < n - i;j++)
			{
    
				printf(" ");
			}
			for (j = 0;j < i + 1;j++)
			{
    
				printf("* ");
			}
			printf("\n");
		}
		
		//A line in the middle
		for (i = 0;i < n + 1;i++)
		{
    
			printf("* ");
		}
		printf("\n");

		//triangle below
		for (i = 0;i < n;i++)
		{
    
			for (j = 0;j < i + 1;j++)
			{
    
				printf(" ");
			}
			for (j = 0;j < n-i;j++)//每行打印的*Decrement line by line
			{
    
				printf("* ");
			}
			printf("\n");
		}
	}
	return 0;
}

思路：The rhombus can be divided into3个部分,上三角,A horizontal line in the middle,下三角.
The only difference between the upper triangle and the lower triangle is that each row of the upper triangle * 增加,Lower triangle for each row * 减少