【2017-12-07】c#基础-循环嵌套练习题

 练习：

1.

1             for (int i = 1; i < 6; i++)
2             {
3                 for (int j=1;j<=i;j++)
4                 {
5                     Console.Write("★");
6                 }
7                 Console.WriteLine();
8             }

2.

1             for (int i = 1; i <= 5; i++)
2             {
3                 for (int j = 1; j <= (6 - i); j++)
4                 {
5                     Console.Write("★");
6                 }
7                 Console.WriteLine();
8             }

3.

 1             for (int i= 1; i<= 5; i++)
 2             {
 3                 for (int j = 1; j <= (5 - i); j++)
 4                 {
 5                     Console.Write("　");
 6                 }
 7                 for (int z = 1; z <= i; z++)
 8                 {
 9                     Console.Write("★");
10                 }
11                 Console.WriteLine();
12             }

4.

 

            for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j <= (i - 1); j++)
                {
                    Console.Write("　");
                }
                for (int z = 1; z <= (6-i); z++)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }

5.

            for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j <= ((9 - (2*i-1)) / 2); j++)
                {
                    Console.Write("　");
                }
                for (int z = 1; z <= (2 * i - 1); z++)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }

6.

            for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j <=(i-1) ; j++)
                {
                    Console.Write("　");
                }
                for (int z = 1; z <= (11-2*i); z++)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }

7.

            Console.Write("请输入一个奇数：");
            int a =Convert.ToInt32(Console.ReadLine());
            if (a % 2 == 0)
            {
                Console.WriteLine("输入有误！");
            }
            else
            {
                for (int i = 1; i <= a; i++)
                {
                    for (int j = 1; j <= a-i; j++)
                    {
                        Console.Write("　");
                    }
                    for (int z = 1; z <= (2 * i - 1); z++)
                    {
                        Console.Write("★");
                    }
                    Console.WriteLine();
                }
                for (int i = 1; i <= (a-1); i++)
                {
                    for (int j = 1; j <= i ; j++)
                    {
                        Console.Write("　");
                    }
                    for (int z = 1; z <= (2*(a-1)+1 - 2 * i); z++)
                    {
                        Console.Write("★");
                    }
                    Console.WriteLine();
                }
            }

8

.

            for (int i = 1; i <= 9; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write(i+"*"+j+"="+(i*j));
                    Console.Write("　");
                }
                Console.WriteLine();
            }