C#第三天

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace _08使用out参数做登陆
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             //分别的提示用户输入用户名和密码
14             //你写一个方法来判断用户输入的是否正确
15             //返回给用户一个登陆结果，并且还要单独的返回给用户一个登陆信息
16             //如果用户名错误，除了返回登陆结果之外，还要返回一个 "用户名错误"
17             //“密码错误”
18             Console.WriteLine("请输入用户名");
19             string userName = Console.ReadLine();
20             Console.WriteLine("请输入密码");
21             string userPwd = Console.ReadLine();
22             string msg;
23             bool b = IsLogin(userName, userPwd, out msg);
24             Console.WriteLine("登陆结果{0}",b);
25             Console.WriteLine("登陆信息{0}",msg);
26             Console.ReadKey();
27         }
28         /// <summary>
29         /// 判断登陆是否成功
30         /// </summary>
31         /// <param name="name">用户名</param>
32         /// <param name="pwd">密码</param>
33         /// <param name="msg">多余返回的登陆信息</param>
34         /// <returns>返回登陆结果</returns>
35         public static bool IsLogin(string name, string pwd, out string msg)
36         {
37             if (name == "admin" && pwd == "888888")
38             {
39                 msg = "登陆成功";
40                 return true;
41             }
42             else if (name == "admin")
43             {
44                 msg = "密码错误";
45                 return false;
46             }
47             else if (pwd == "888888")
48             {
49                 msg = "用户名错误";
50                 return false;
51             }
52             else
53             {
54                 msg = "未知错误";
55                 return false;
56             }
57         }
58     }
59 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace _10ref参数
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             double salary = 5000;
14             JiangJin(ref salary);
15             Console.WriteLine(salary);
16             Console.ReadKey();
17         }
18 
19         public static void JiangJin(ref double s)
20         {
21             s += 500;
22 
23         }
24 
25         public static void FaKuan(double s)
26         {
27             s -= 500;
28         }
29     }
30 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace _10ref参数
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             double salary = 5000;
14             JiangJin(ref salary);
15             Console.WriteLine(salary);
16             Console.ReadKey();
17         }
18 
19         public static void JiangJin(ref double s)
20         {
21             s += 500;
22 
23         }
24 
25         public static void FaKuan(double s)
26         {
27             s -= 500;
28         }
29     }
30 }