C# If Else, IF ElseIf Else语句

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Text;  
  5. using System.Threading.Tasks;  
  6.   
  7. namespace _12if_else练习  
  8. {  
  9.     class Program  
  10.     {  
  11.         static void Main(string[] args)  
  12.         {  
  13.             //如果小赵的考试成绩大于90(含)分,那么爸爸奖励他100元钱,  
  14.             //否则的话,爸爸就让小赵跪方便面.  
  15.             //Console.WriteLine("请输入小赵的考试成绩");  
  16.             //int score = Convert.ToInt32(Console.ReadLine());  
  17.             //if (score >= 90)  
  18.             //{  
  19.             //    Console.WriteLine("奖励你一百块");  
  20.             //}  
  21.             //else  
  22.             //{  
  23.             //    Console.WriteLine("去跪方便面");  
  24.             //}  
  25.             //Console.ReadKey();  
  26.   
  27.             //对学员的结业考试成绩评测  
  28.             //         成绩>=90 ：A  
  29.             //90>成绩>=80 ：B    
  30.             //80>成绩>=70 ：C  
  31.             //70>成绩>=60 ：D  
  32.             //         成绩<60   ：E  
  33.   
  34.   
  35.             Console.WriteLine("请输入学员的考试成绩");  
  36.             int score = Convert.ToInt32(Console.ReadLine());  
  37.             //最正确的做法  
  38.   
  39.             if (score >= 90)  
  40.             {  
  41.                 Console.WriteLine("A");  
  42.             }  
  43.             else if (score >= 80)  
  44.             {  
  45.                 Console.WriteLine("B");  
  46.             }  
  47.             else if (score >= 70)  
  48.             {  
  49.                 Console.WriteLine("C");  
  50.             }  
  51.             else if (score >= 60)  
  52.             {  
  53.                 Console.WriteLine("D");  
  54.             }  
  55.             //else if (score < 60)  
  56.             //{  
  57.             //    Console.WriteLine("E");  
  58.             //}  
  59.             else  
  60.             {  
  61.                 Console.WriteLine("E");  
  62.             }  
  63.   
  64.             Console.ReadKey();  
  65.  
  66.  
  67.  
  68.  
  69.             #region if的做法  
  70.             //if (score >= 90 && score < 100)  
  71.             //{  
  72.             //    Console.WriteLine("A");  
  73.             //}  
  74.             //if (score >= 80 && score < 90)//ctrl+k+d  
  75.             //{  
  76.             //    Console.WriteLine("B");  
  77.             //}  
  78.             //if (score >= 70 && score < 80)  
  79.             //{  
  80.             //    Console.WriteLine("C");  
  81.             //}  
  82.             //if (score >= 60 && score < 70)//98  88  
  83.             //{  
  84.             //    Console.WriteLine("D");  
  85.             //}  
  86.             ////else  
  87.             ////{  
  88.             ////    Console.WriteLine("E");  
  89.             ////}  
  90.             //if (score < 60)  
  91.             //{  
  92.             //    Console.WriteLine("E");  
  93.             //}  
  94.             #endregion  
  95.             #region if else-if  
  96.             //if (score >= 90)  
  97.             //{  
  98.             //    Console.WriteLine("A");  
  99.             //}  
  100.             //else//<90   
  101.             //{  
  102.             //    if (score >= 80)  
  103.             //    {  
  104.             //        Console.WriteLine("B");  
  105.             //    }  
  106.             //    else//<80  
  107.             //    {  
  108.             //        if (score >= 70)  
  109.             //        {  
  110.             //            Console.WriteLine("C");  
  111.             //        }  
  112.             //        else//<70  
  113.             //        {  
  114.             //            if (score >= 60)  
  115.             //            {  
  116.             //                Console.WriteLine("D");  
  117.             //            }  
  118.             //            else//<60  
  119.             //            {  
  120.             //                Console.WriteLine("E");  
  121.             //            }  
  122.             //        }  
  123.             //    }  
  124.             //}   
  125.             #endregion  
  126.             Console.ReadKey();  
  127.   
  128.         }  
  129.     }  
  130. }  
shashou47

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