Visual Basic 赋值运算符

基本的赋值运算符是 "="。他的优先级别低于其他的运算符，所以对该运算符往往最后读取。

VB 支持下列赋值运算符:

运算符	描述	说明
=	简单赋值操作符，将右侧操作数的值赋给左侧操作数	C = A + B 将把 A + B 的值赋值给 C
+=	添加和赋值操作符，它将右操作数添加到左操作数，并将结果赋给左操作数	C += A 等效于 C = C + A
-=	减去和赋值运算符，从左边的操作数中减去右边的操作数，并将结果赋给左边的操作数	C -= A 等效于 C = C - A
*=	乘法和赋值运算符，它将右操作数与左操作数相乘，并将结果赋给左操作数	C = A 等效于 C = C A
/=	除法和赋值运算符，用左操作数和右运算数分开，赋值给左操作数(浮点除法)	C /= A 等效于 C = C / A
\=	除法和赋值运算符，用左操作数除以右操作数，并将结果赋给左操作数(整数除法)	C \= A 等效于 C = C \A
^=	指数运算和赋值运算符。它将左操作数指定的右操作数指数的幂值，并将结果赋给左操作数。	C^=A 等效于 C = C ^ A
<<=	左移和赋值运算符	C <<= 2 等效于 C = C << 2
>>=	右移和赋值运算符	C >>= 2 等效于 C = C >> 2
&=	将一个字符串(String)表达式连接到一个字符串(String)变量或属性，并将结果赋给变量或属性。	Str1 &= Str2 等效于 Str1 = Str1 & Str2

实例

尝试下面的例子来理解 VB 的所有赋值运算符:

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

运行一下

结果如下:

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

Visual Basic 赋值运算符

实例

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