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      • c#教程之值類型的初值和默認構造函數

      • 2015-01-21 21:47 來源:未知

      1.4.1 值類型的初值和默認構造函數(相關C#教程)

      所有變量都要求必須有初值,如沒有賦值,采用默認值。對于簡單類型,sbyte、byte、short、ushort、int、uint、long和ulong默認值為0,char類型默認值是(char)0,float為0.0f,double為0.0d,decimal為0.0m,bool為false,枚舉類型為0,在結構類型和類中,數據成員的數值類型變量設置為默認值,引用類型變量設置為null。
      可以顯示的賦值,例如int i=0。而對于復雜結構類型,其中的每個數據成員都按此種方法賦值,顯得過于麻煩。由于數值類型都是結構類型,可用new語句調用其構造函數初始化數值類型變量,例如:int j=new int()。請注意,用new語句并不是把int變量變為引用變量,j仍是值類型變量,這里new僅僅是調用其構造函數。所有的數值類型都有默認的無參數的構造函數,其功能就是為該數值類型賦初值為默認值。對于自定義結構類型,由于已有默認的無參數的構造函數,不能再定義無參數的構造函數,但可以定義有參數的構造函數。
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