VB.Net - 賦值運算子

VB.Net 支援以下賦值運算子：

運算子	描述	示例
=	簡單賦值運算子，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
+=	加法賦值運算子，將右側運算元加到左側運算元上，並將結果賦給左側運算元	C += A 等價於 C = C + A
-=	減法賦值運算子，將右側運算元從左側運算元中減去，並將結果賦給左側運算元	C -= A 等價於 C = C - A
*=	乘法賦值運算子，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 等價於 C = C A
/=	除法賦值運算子，將左側運算元除以右側運算元，並將結果賦給左側運算元（浮點數除法）	C /= A 等價於 C = C / A
\=	除法賦值運算子，將左側運算元除以右側運算元，並將結果賦給左側運算元（整數除法）	C \= A 等價於 C = C \ A
^=	冪運算賦值運算子，將左側運算元提升到右側運算元的冪，並將結果賦給左側運算元	C ^= A 等價於 C = C ^ A
<<=	左移賦值運算子	C <<= 2 等價於 C = C << 2
>>=	右移賦值運算子	C >>= 2 等價於 C = C >> 2
&=	將字串表示式連線到字串變數或屬性，並將結果賦給該變數或屬性。	Str1 &= Str2 等價於 Str1 = Str1 & Str2

示例

嘗試以下示例以瞭解 VB.Net 中所有可用的賦值運算子：

Module assignment
   Sub Main()
      Dim a As Integer = 21
      Dim pow As Integer = 2
      Dim str1 As String = "Hello! "
      Dim str2 As String = "VB Programmers"
      Dim c As Integer
      c = a
      Console.WriteLine("Line 1 - =  Operator Example, _
      Value of c = {0}", c)
         c += a
         Console.WriteLine("Line 2 - +=  Operator Example, _
      Value of c = {0}", c)
         c -= a
         Console.WriteLine("Line 3 - -=  Operator Example, _
      Value of c = {0}", c)
         c *= a
         Console.WriteLine("Line 4 - *=  Operator Example, _
      Value of c = {0}", c)
         c /= a
         Console.WriteLine("Line 5 - /=  Operator Example, _
      Value of c = {0}", c)
         c = 20
         c ^= pow
         Console.WriteLine("Line 6 - ^=  Operator Example, _
      Value of c = {0}", c)
         c <<= 2
         Console.WriteLine("Line 7 - <<=  Operator Example,_
      Value of c = {0}", c)
         c >>= 2
         Console.WriteLine("Line 8 - >>=  Operator Example,_
      Value of c = {0}", c)
         str1 &= str2
         Console.WriteLine("Line 9 - &=  Operator Example,_
      Value of str1 = {0}", str1)
         Console.ReadLine()
   End Sub
End Module

當以上程式碼編譯並執行時，會產生以下結果：

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 = 400
Line 7 - <<= Operator Example, Value of c = 1600
Line 8 - >>= Operator Example, Value of c = 400
Line 9 - &= Operator Example, Value of str1 = Hello! VB Programmers

vb.net_operators.htm

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