20141016--for 菱形

 1             Console.Write("请输入一个数：");
 2             int n = int.Parse(Console.ReadLine());
 3             for (int i = 1; i <= n; i++)
 4             {
 5                 for (int b = 1; b <= n - i; b++)
 6                 {
 7                     Console.Write("  ");
 8                 }
 9                 for (int j = 1; j <= 2 * i - 1; j++) 
10                 {
11                     Console.Write("☆");
12                 }
13                 Console.Write("\n");
14             }
15             for (int p = 1; p <= n; p++)
16             {
17                 for (int o = 1; o <= p; o++)
18                 {
19                     Console.Write("  ");
20                 }
21                 for (int k = 1; k <= 2 * (n - p) - 1; k++)
22                 {
23                     Console.Write("☆");
24                 }
25                 Console.Write("\n");
26             }
27 
28                 Console.ReadLine();