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VB.Net賦值運算子

2019-10-16 23:02:31

VB.Net支援下列賦值運算子：

運算子 描述 說明
= 簡單賦值操作符，將右側運算元的值賦給左側運算元 C = A + B將把A + B的值賦值給C
+= 新增和賦值操作符，它將右運算元新增到左運算元，並將結果賦給左運算元 C += A 等效於 C = C + A
-= 減去和賦值運算子，從左邊的運算元中減去右邊的運算元，並將結果賦給左邊的運算元 C -= A 等效於 C = C - A
*= 乘法和賦值運算子，它將右運算元與左運算元相乘，並將結果賦給左運算元 C *= A 等效於 C = C * A
/= 除法和賦值運算子，用左運算元和右運算數分開，賦值給左運算元(浮點除法) C /= A 等效於 C = C / A
\= 除法和賦值運算子，用左運算元除以右運算元，並將結果賦給左運算元(整數除法) C \= A 等效於 C = C \A
^= 指數運算和賦值運算子。它將左運算元指定的右運算元指數的冪值，並將結果賦給左運算元。 C^=A 等效於 C = C ^ A
<<= 左移和賦值運算子 C <<= 2 等效於 C = C << 2
>>= 右移和賦值運算子 C >>= 2 等效於 C = C >> 2
&= 將一個字串(String)表示式連線到一個字串(String)變數或屬性，並將結果賦給變數或屬性。 Str1 &= Str2 等效於 Str1 = Str1 & Str2

範例：

嘗試下面的例子來理解VB.Net中的所有賦值運算子，檔案：assignmentOp.vb

Module assignmentOp
   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

執行上面範例程式碼，得到以下結果 - 

F:\worksp\vb.net\operators>vbc assignmentOp.vb
F:\worksp\vb.net\operators>assignmentOp.exe
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