Else block not working

Question

每當我爲分母輸入一個無效的數字（例如數字太長或字母）時，我總是會得到「NOtZero」。我的If/Else語句邏輯不正確。什麼是錯的，我該如何解決這個問題？

static void Main(string[] args) 
{ 
    Console.WriteLine("Enter Numerator"); 
    int numerator; 
    bool IsNumeratorConverstionSucess=Int32.TryParse(Console.ReadLine(), out numerator); 

    if (IsNumeratorConverstionSucess) 
    { 

     Console.WriteLine("Enter Denominator"); 
     int denominator; 
     bool IsdenominatorConverstionSucess = Int32.TryParse(Console.ReadLine(), out denominator); 
     if (IsdenominatorConverstionSucess && denominator != 0) 
     { 
      int result = numerator/denominator; 
      Console.WriteLine("Result is = {0}", result); 
     } 
     else 
     { 
      if(denominator==0) 
      { 
       Console.WriteLine("NOtZero"); 
      } 
      else 
      { 
      Console.WriteLine("Deominator Should Be A Valid Number Between {0} To {1} Range", Int32.MinValue, Int32.MaxValue); 
      } 
     } 
    } 
    else 
    { 
     Console.WriteLine("Numerator Should Be A Valid Number Between {0} To {1} Range",Int32.MinValue,Int32.MaxValue); 
    } 
} 

Answer 1

，當你進入一個無效的分母你得到「NOtZero」究其原因，是因爲int.tryparse套它的輸出參數爲0時，它失敗。所以，你的代碼是使用下面的工作流程時，你的分母值輸入a：

1. 實例化一個名爲denominator
2. 嘗試將用戶輸入轉換爲整數變量，並返回到denominator
3. 轉換失敗，那麼返回false，設置denominator設置爲0

Answer 2

Johnie卡爾是正確的，因爲分母將始終爲0，如果解析失敗了你的邏輯失敗。

做到這一點的另一種方法是在成功分支內移動零檢查邏輯。

if (IsdenominatorConverstionSucess) 
{ 
    if(denominator==0) 
    { 
     Console.WriteLine("NOtZero"); 
    } 
    else 
    { 
     int result = numerator/denominator; 
     Console.WriteLine("Result is = {0}", result); 
    } 

} 
else 
{ 
    Console.WriteLine("Denominator Should Be A Valid Number Between {0} To {1} Range", Int32.MinValue, Int32.MaxValue); 
}