D 程式設計 - 賦值運算子

D 語言支援以下賦值運算子：

運算子	描述	示例
=	這是簡單的賦值運算子。它將右側運算元的值賦給左側運算元。	C = A + B 將 A + B 的值賦給 C
+=	這是加法並賦值運算子。它將右側運算元加到左側運算元，並將結果賦給左側運算元。	C += A 等效於 C = C + A
-=	這是減法並賦值運算子。它從左側運算元減去右側運算元，並將結果賦給左側運算元。	C -= A 等效於 C = C - A
*=	這是乘法並賦值運算子。它將右側運算元乘以左側運算元，並將結果賦給左側運算元。	C = A 等效於 C = C A
/=	這是除法並賦值運算子。它將左側運算元除以右側運算元，並將結果賦給左側運算元。	C /= A 等效於 C = C / A
%=	這是取模並賦值運算子。它使用兩個運算元進行取模運算，並將結果賦給左側運算元。	C %= A 等效於 C = C % A
<<=	這是左移並賦值運算子。	C <<= 2 等效於 C = C << 2
>>=	這是右移並賦值運算子。	C >>= 2 等效於 C = C >> 2
&=	這是按位與並賦值運算子。	C &= 2 等效於 C = C & 2
^=	這是按位異或並賦值運算子。	C ^= 2 等效於 C = C ^ 2
\|=	這是按位或並賦值運算子。	C \|= 2 等效於 C = C \| 2

示例

嘗試以下示例以瞭解 D 程式語言中所有可用的賦值運算子：

線上演示

import std.stdio;

int main(string[] args) {
   int a = 21;
   int c ;

   c =  a; 
   writefln("Line 1 - =  Operator Example, Value of c = %d\n", c );  
   
   c +=  a; 
   writefln("Line 2 - += Operator Example, Value of c = %d\n", c );
   
   c -=  a; 
   writefln("Line 3 - -= Operator Example, Value of c = %d\n", c );
   
   c *=  a; 
   writefln("Line 4 - *= Operator Example, Value of c = %d\n", c ); 
   
   c /=  a; 
   writefln("Line 5 - /= Operator Example, Value of c = %d\n", c );  
   
   c  = 200; 
   c = c % a; 
   writefln("Line 6 - %s= Operator Example, Value of c = %d\n",'\x25', c );
   
   c <<=  2; 
   writefln("Line 7 - <<= Operator Example, Value of c = %d\n", c ); 
   
   c >>=  2; 
   writefln("Line 8 - >>= Operator Example, Value of c = %d\n", c );
   
   c &=  2; 
   writefln("Line 9 - &= Operator Example, Value of c = %d\n", c ); 
   
   c ^=  2; 
   writefln("Line 10 - ^= Operator Example, Value of c = %d\n", c ); 
   
   c |=  2; 
   writefln("Line 11 - |= Operator Example, Value of c = %d\n", c );
   
   return 0; 
}

編譯並執行上述程式後，將產生以下結果：

Line 1 - =  Operator Example, Value of c = 21
  
Line 2 - += Operator Example, Value of c = 42
  
Line 3 - -= Operator Example, Value of c = 21
  
Line 4 - *= Operator Example, Value of c = 441
  
Line 5 - /= Operator Example, Value of c = 21 
 
Line 6 - %= Operator Example, Value of c = 11
  
Line 7 - <<= Operator Example, Value of c = 44 
 
Line 8 - >>= Operator Example, Value of c = 11 
 
Line 9 - &= Operator Example, Value of c = 2

Line 10 - ^= Operator Example, Value of c = 0 
 
Line 11 - |= Operator Example, Value of c = 2

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