正三角型的數字呈現方法

 1  public static void sum()
 2         {
 3             string n = string.Empty;
 4             Console.Write("Input n:");
 5             n = Console.ReadLine();
 6 
 7             string[,] sum = new string[Convert.ToInt32(n) + 1, Convert.ToInt32(n) + 1];
 8             for (int i = 0; i <= Convert.ToInt32(n); i++)
 9             {
10                 for (int j = 0; j <= Convert.ToInt32(n); j++)
11                 {
12                     if (i == 0 && j == 0)
13                     {
14                     }
15                     else if (i == 0 || j == 0)
16                     {
17                         sum[i, j] = Convert.ToString(i + j);
18                     }
19                     else if (i >= j)
20                     {
21                         sum[i, j] = Convert.ToString(i * j);
22                     }
23                     else
24                     {
25                         sum[i, j] = "";
26                     }
27                 }
28             }
29             for (int i = 0; i <= Convert.ToInt32(n); i++)
30             {
31                 for (int j = 0; j <= Convert.ToInt32(n); j++)
32                 {
33                     if (i == 0 && j == 0)
34                     {
35                         Console.Write(‘*‘ + "     ");
36                     }
37                     else
38                     {
39                         Console.Write(sum[i, j] + "     ");
40                     }
41                 }
42                 Console.WriteLine();
43                 Console.WriteLine();
44             }
45             Console.ReadLine();
46         }