我的代碼有什麼問題？

Question

開始：

 int UserInput1; 
     int UserInput2; 
     int UserInput3; 

     Console.WriteLine("Input the first number: "); 
     UserInput1 = Convert.ToInt32(Console.ReadLine()); 

     Console.ReadKey(); 
     Console.WriteLine(); 

     Console.WriteLine("Input the second number: "); 
     UserInput2 = Convert.ToInt32(Console.ReadLine()); 

     Console.ReadKey(); 
     Console.WriteLine(); 

     Console.WriteLine("What is " + UserInput1 + " divided by " + UserInput2 + "?"); 
     UserInput3 = Convert.ToInt32(Console.ReadLine()); 

     Console.ReadKey(); 
     Console.WriteLine(); 

     int Answer = UserInput1/UserInput2; 

     if (Answer != UserInput3) 
     { 

      Console.WriteLine("Wrong answer, try again. "); 

      goto Start; 


     } 
     else if (Answer == UserInput3) 
     { 

      Console.WriteLine("Congratulation, your are correct. The correct answer, as you've \nstated is " + UserInput3); 

     } 

這工作。但是，當我用「else」替換「else if」時，會彈出一個錯誤消息，說在「（Answer == UserInput3）」後面會出現分號。「

這是一個錯誤還是我沒有看到一個簡單的錯誤？

感謝您的閱讀。

Answer 1

您要更換...

if (...) { 
    ... 
} else if (...) { 
    ... 
} 

與

if (...) { 
    ... 
} else (...) { 
    ... 
} 

後者不是有效的構造：else並不需要的條件。您需要if。

Answer 2

這是因爲「else」語句沒有采用條件，並且如果if語句爲假，它會自動運行。 Shoulde是：

if (Answer != UserInput3) 
    { 

     Console.WriteLine("Wrong answer, try again. "); 

     goto Start; 


    } 
    else 
    { 

     Console.WriteLine("Congratulation, your are correct. The correct answer, as you've \nstated is " + UserInput3); 

    }