即使相同的教程代碼編譯，什麼使得我的代碼不能編譯？

Question

我的代碼：

using System: 
namespace Hero2 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      int herohitpoints, monsterhitpoints, attackdamage; 
      herohitpoints = 20; 
      monsterhitpoints = 15; 
      attackdamage = 8; 
      Console.WriteLine("The hero has {0}hp and the monster has {1}hp.", herohitpoints, monsterhitpoints); 
      do 
      { 
       herohitpoints -= attackdamage; 
       monsterhitpoints -= attackdamage; 
       Console.WriteLine("The hero attacks for {0}hp of damage", attackdamage); 
       Console.WriteLine("The monster attacks for {0}hp of damage", attackdamage); 
       Console.WriteLine("The hero now has {0}hp and the monster has {1}hp", herohitpoints, monsterhitpoints); 
       Console.ReadLine(); 
      } 
      while (herohitpoints >0&&monsterhitpoints>0); 
     } 
    } 
} 

這裏是我一直在複製下來的教程代碼：

using System; 
namespace Hero3 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      int herohitpoints, monsterhitpoints, attackdamage; 
      herohitpoints = 20; 
      monsterhitpoints = 15; 
      attackdamage = 8; 
      Console.WriteLine("The hero has {0}hp, and the monster has {1}hp", herohitpoints,monsterhitpoints); 
      do 
      {    
       herohitpoints -= attackdamage; 
       monsterhitpoints -= attackdamage; 
       Console.WriteLine("The hero attacks for {0}hp of damage", attackdamage); 
       Console.WriteLine("The monster attacks for {0}hp of damage", attackdamage); 
       Console.WriteLine("The hero now has {0}hp, and the monster has {1}hp",herohitpoints, monsterhitpoints); 
       Console.ReadLine(); 
      } 
      while (herohitpoints >0&&monsterhitpoints>0); 
     } 
    } 
} 

我已經花了一封信在最後一小時搜索通過這封信，試圖看到什麼這是我做錯了，但我無法在任何地方找到它。 從教程網站複製粘貼的代碼編譯和運行完美，但我的不會。我究竟做錯了什麼？

Answer 1

在開始時你需要一個;而不是:。 所以它應該是using System;，而不是using System:。