作业：12.23

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace ConsoleApplication1
 7 {
 8     class Class1
 9     {
10         //五行五列
11         static void Main(string[] args)
12         {
13             for (int i = 1; i <= 5;i++ )
14             {
15                 for (int j = 1; j <= 5;j++ )
16                 {
17                     Console.Write("*");
18                 }
19                 Console.WriteLine();
20             }
21         }
22     }
23 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace ConsoleApplication1
 7 {
 8     class Class2
 9     {
10         static void Main(string[] args)
11         {
12             for (int i = 1; i <= 5;i++ )
13             {
14                 for (int j = 1; j <= i;j++ )
15                 {
16                     Console.Write("*");
17                 }
18                 Console.WriteLine();
19             }
20         }
21     }
22 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace ConsoleApplication1
 7 {
 8     class Class3
 9     {
10         static void Main(string[] args)
11         {
12             for (int i = 1; i <= 5;i++ )
13             {
14                 for (int j = 1; j <= 6 - i;j++ )
15                 {
16                     Console.Write("*");
17                 }
18                 Console.WriteLine();
19             }
20         }
21     }
22 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace ConsoleApplication1
 7 {
 8     class Class5
 9     {
10         static void Main(string[] args)
11         {
12             for (int i = 1; i <= 5;i++ )
13             {
14                 for (int j = 1; j <= 5 - i;j++ )
15                 {
16                     Console.Write(" ");
17                 }
18                 for (int m = 1; m <= i;m++ )
19                 {
20                     Console.Write("*");
21                 }
22                 Console.WriteLine();
23             }
24         }
25     }
26 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace ConsoleApplication1
 7 {
 8     class Class4
 9     {
10         static void Main(string[] args)
11         {
12             for (int i = 1; i <= 5;i++ )
13             {
14                 for (int m = 1; m <= 5 - i;m++ )
15                 {
16                     Console.Write(" ");
17                 }
18                 for (int j = 1; j <= (2 * i - 1);j++ )
19                 {
20                     Console.Write("*");
21                 }
22                 Console.WriteLine();
23             }
24         }
25     }
26 }