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  • C#和.Ne学习

    练习：

     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication1
 8 {
 9     class Program
10     {
11         /*
12          * 用方法来实现：
13          * 有一个字符串数组｛"马龙","迈克尔乔丹","雷吉米勒","蒂姆驰肯","科比布莱恩特"｝
14          * 计算出最长的字符串
15          */
16         static void Main(string[] args)
17         {
18             string[] name = { "马龙", "迈克尔乔丹", "雷吉米勒", "蒂姆驰肯", "科比布莱恩特" };
19             Console.WriteLine(Max(name));
20             Console.ReadKey();
21         }
22         /// <summary>
23         /// 返回一个字符串数组中最长的字符串
24         /// </summary>
25         /// <param name="name">接收一个字符串数组</param>
26         /// <returns>返回那个最长的字符串</returns>
27         public static string Max(string[] name)
28         {
29             int a = 0;
30             for (int t = 1; t < name.Length; ++t)
31             {
32                 if (name[a].Length < name[t].Length)
33                 {
34                     a = t;
35                 }
36             }
37 
38                 return name[a];
39         }
40     }
41 }
    1
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication2
 8 {
 9     class Program
10     {
11         /*
12          * 用方法来实现：
13          * 请计算出一个整型数组的平均值保留两位小数
14          */
15         static void Main(string[] args)
16         {
17             int[] a = {2, 98, 1, 83, 9, 71, 66};
18 
19             Console.WriteLine("平均值为：{0:f2}",Program.GetAverage(a));
20             Console.ReadKey();
21         }
22         /// <summary>
23         /// 返回一个整型数组的平均值，保留两位小数
24         /// </summary>
25         /// <param name="a">接收要计算的数组</param>
26         /// <returns>返回这个数组的平均值</returns>
27         public static double GetAverage(int[] a)
28         {
29             double average;
30             int sum = 0;
31 
32             for (int t = 0; t < a.Length; ++t)
33             {
34                 sum += a[t];
35             }
36             average = sum / a.Length * 1.00;
37 
38                 return average;
39         }
40     }
41 }
    2
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication4
 8 {
 9     class Program
10     {
11         /*
12          * 写一个方法，用来判断用户输入的数字是不是质数
13          * 再写一个方法，要求用户只能输入数字 输入有误就一直让用户输入
14          */
15         static void Main(string[] args)
16         {
17             int a;
18 
19             Console.Write("请输入一个数：");
20             Program.JudgeNumber(out a);
21 
22             Console.WriteLine(Program.PrimeNumber(a));
23             Console.ReadKey();
24         }
25         /// <summary>
26         /// 判断一个数是否是质数
27         /// </summary>
28         /// <param name="a">接收一个要判断的数</param>
29         /// <returns>返回判断结果</returns>
30         public static bool PrimeNumber(int a)
31         {
32             if(a<2)
33             {
34                 return false;
35             }
36             else
37             {
38                 for (int t = 2; t <= a / 2; ++t)
39                 {
40                     if (0 == a % t)
41                     {
42                         return false;
43                     }
44                 }
45                 return true;
46             }
47         }
48         public static void JudgeNumber(out int  a)
49         {
50             while (true)
51             {
52                 try
53                 {
54                     a = Convert.ToInt32(Console.ReadLine());
55                     break;
56                 }
57                 catch (Exception ex)
58                 {
59                     Console.WriteLine(ex);
60                     Console.Write("请重新输入：");
61                 }
62             }
63             return;
64         }
65     }
66 }
    3
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication1
 8 {
 9     class Program
10     {
11         /*
12          * 收受输入后判断其等级并显示出来。
13          * 判断依据如下，等级=
14          * 优（90~100）良（80~89）中(70~79)及格（60~69）差（0~59）
15          */
16         static void Main(string[] args)
17         {
18             double grade;
19 
20             Console.Write("请输入一个成绩：");
21             try
22             {
23                 grade = Convert.ToDouble(Console.ReadLine());
24                 Console.WriteLine(JudgeGrade(grade));
25             }
26             catch(Exception ex)
27             {
28                 Console.WriteLine(ex);
29             }
30             
31             Console.ReadKey();
32         }
33         public static string JudgeGrade(double a)
34         {
35             if (90 <= a && 100 >= a )
36             {
37                 return "优";
38             }
39             else if (80 <= a && 89 >= a)
40             {
41                 return "良";
42             }
43             else if (70 <= a && 79 >= a)
44             {
45                 return "中";
46             }
47             else if (60 <= a && 69 >= a)
48             {
49                 return "及格";
50             }
51             else
52             {
53                 return "差";
54             }
55         }
56     }
57 }
    4
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication2
 8 {
 9     class Program
10     {
11         /*
12          * 将字符串数组｛"中国","美国","巴西","澳大利亚","加拿大"｝的内容反转
13          */
14         static void Main(string[] args)
15         {
16             string[] str = { "中国", "美国", "巴西", "澳大利亚", "加拿大" };
17             Program.Reverse(str);
18             
19 
20             for (int t = 0; t < str.Length; ++t)
21             {
22                 Console.Write(str[t]+" ");
23             }
24                 Console.ReadKey();
25 
26         }
27         public static void Reverse(string[] str)
28         {
29             for (int t1 = 0,t2=str.Length-1; t1<t2 ; ++t1,--t2)
30             {
31                 string temp = str[t1];
32                 str[t1] = str[t2];
33                 str[t2] = temp;
34             }
35                 return;
36         }
37     }
38 }
    5
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 
 8 namespace ConsoleApplication1
 9 {
10     
11     class Program
12     {
13         const double PI = 3.1415;
14         static void Main(string[] args)
15         {
16             double r = 9;
17             double perimeter = Program.Perimeter(r);
18             double area = Program.Area(r);
19 
20             Console.WriteLine("周长：{0:0.00}面积：{1:0.00}", perimeter, area);
21             Console.ReadKey();
22         }
23         /// <summary>
24         /// 计算周长
25         /// </summary>
26         /// <param name="r">传入半径</param>
27         /// <returns>返回周长</returns>
28         public static double Perimeter(double r)
29         {
30             double perimeter = 2 * r * PI;
31 
32             return perimeter;
33         }
34         /// <summary>
35         /// 计算面积
36         /// </summary>
37         /// <param name="r">传入半径</param>
38         /// <returns>返回面积</returns>
39         public static double Area(double r)
40         {
41             double area = r * r * PI;
42 
43             return area;
44         }
45 
46     }
47 }
    6
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 
 8 namespace ConsoleApplication1
 9 {
10     
11     class Program
12     {
13         const double PI = 3.1415;
14         static void Main(string[] args)
15         {
16             double r = 9;
17             double perimeter = Program.Perimeter(r);
18             double area = Program.Area(r);
19 
20             Console.WriteLine("周长：{0:0.00}面积：{1:0.00}", perimeter, area);
21             Console.ReadKey();
22         }
23         /// <summary>
24         /// 计算周长
25         /// </summary>
26         /// <param name="r">传入半径</param>
27         /// <returns>返回周长</returns>
28         public static double Perimeter(double r)
29         {
30             double perimeter = 2 * r * PI;
31 
32             return perimeter;
33         }
34         /// <summary>
35         /// 计算面积
36         /// </summary>
37         /// <param name="r">传入半径</param>
38         /// <returns>返回面积</returns>
39         public static double Area(double r)
40         {
41             double area = r * r * PI;
42 
43             return area;
44         }
45 
46     }
47 }
    6
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication1
 8 {
 9     class Program
10     {
11         /*
12          * 计算任意多个数的最大值（提示：params）
13          */
14         static void Main(string[] args)
15         {
16             Console.WriteLine(Program.GetMax(2, 8, 9, 1, 14, 12).ToString());
17         }
18         /// <summary>
19         /// 返回一个整型数组的最大值
20         /// </summary>
21         /// <param name="a">接收数据的整型数组</param>
22         /// <returns>返回数组中最大值</returns>
23         public static int GetMax(params int[] a)
24         {
25             int max = a[0];
26             for (int t = 1; t < a.Length - 1; ++t)
27             {
28                 if (max < a[t])
29                 {
30                     max = a[t];
31                 }
32             }
33 
34                 return max;
35         }
36     }
37 }
    7
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication2
 8 {
 9     class Program
10     {
11         /*
12          * 计算通过冒泡排序法对整型数组{1, 3, 5, 7, 90, 2, 4, 6, 8, 10}实现升序排序
13          */
14         static void Main(string[] args)
15         {
16             int[] a = { 1, 3, 5, 7, 90, 2, 4, 6, 8, 10 };
17             Program.ArraySort(a);
18 
19             Program.ArrayShow(a);
20 
21             Console.ReadKey();
22         }
23         /// <summary>
24         /// 为一个整型数组排序
25         /// </summary>
26         /// <param name="a">要排序的数组</param>
27         public static void ArraySort(int[] a)
28         {
29             for (int i = 0; i < a.Length - 1; ++i)
30             {
31                 for (int j = i + 1; j <= a.Length - 1; ++j)
32                 {
33                     if (a[i] > a[j])
34                     {
35                         a[i] = a[i]+a[j];
36                         a[j] = a[i]-a[j];
37                         a[i] = a[i]-a[j];
38                     }
39                 }
40             }
41 
42                 return;
43         }
44         /// <summary>
45         ///控制台输出一个数组的每个元素
46         /// </summary>
47         /// <param name="a">要输入的数组</param>
48         public  static void ArrayShow(int[] a)
49         {
50             for (int t = 0; t <= a.Length - 1; ++t)
51             {
52                 Console.Write(a[t]);
53                 Console.Write(" ");
54             }
55             Console.Write("
");
56 
57                 return;
58         }
59     }
60 }
    8
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication3
 8 {
 9     class Program
10     {
11         /*
12          * 用方法实现，请计算出一个整型数组的平均值
13          * {1, 3, 5, 7, 93, 33, 4, 4, 6, 8, 10 }.
14          * 要求计算结果如果有小数保留后两位（四舍五入）
15          */
16         static void Main(string[] args)
17         {
18             int[] a = { 1, 3, 5, 7, 93, 33, 4, 4, 6, 8, 10 };
19 
20             Console.WriteLine("{0:0.00}", ArrayAverage(a));
21             Console.ReadKey();
22         }
23         /// <summary>
24         /// 返回一个整型数组的平均值
25         /// 保留后两位小数（四舍五入）
26         /// </summary>
27         /// <param name="a">计算平均值的数组</param>
28         /// <returns>返回数组的平均值</returns>
29         public static double ArrayAverage(int[] a)
30         {
31             double average = 0;
32             for (int t = 0; t < a.Length; ++t)
33             {
34                 average +=a[t];
35             }
36             average = average * 1.000 / a.Length;
37 
38                 return average;
39         }
40     }
41 }
    9
     1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication1
 8 {
 9     class Program
10     {
11         /*
12          * 将一个字符串数组输出为|分割的形式，比如“梅西|卡卡|郑大世”
13          */
14         static void Main(string[] args)
15         {
16             string[] str = { "梅西", "卡卡", "郑大世" };
17 
18             Program.StringShow(ref str);
19 
20 
21             Console.ReadKey();
22         }
23         /// <summary>
24         /// 字符串用|分割输出
25         /// </summary>
26         /// <param name="str">要分割输出的字符串</param>
27         public static void StringShow(ref string[] str)
28         {
29             for (int t = 0; t < str.Length; ++t)
30             {
31                 Console.Write(str[t]);
32                 if (t != str.Length - 1)
33                 {
34                     Console.Write("|");
35                 }
36             }
37             Console.Write("
");
38         }
39     }
40 }
    10
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  • 原文地址：https://www.cnblogs.com/2016Study/p/5479471.html
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