VB.Net - 运算符优先级

2022-06-02 14:11 更新

运算符优先级确定表达式中的术语分组。这会影响表达式的计算方式。某些运营商比其他运营商具有更高的优先级; 例如，乘法运算符的优先级高于加法运算符：
例如，x = 7 + 3 * 2; 这里，x被分配13，而不是20，因为operator *具有比+高的优先级，因此它首先乘以3 * 2，然后加到7。

这里，具有最高优先级的运算符出现在表的顶部，具有最低优先级的运算符出现在底部。在表达式中，将首先计算较高优先级运算符。

操作符	优先级
Await	最高
Exponentiation (^)
Unary identity and negation (+, -)
Multiplication and floating-point division (*, /)
Integer division (\)
Modulus arithmetic (Mod)
Addition and subtraction (+, -)
Arithmetic bit shift (<<, >>)
All comparison operators (=, <>, <, <=, >, >=, Is, IsNot, Like, TypeOf...Is)
Negation (Not)
Conjunction (And, AndAlso)
Inclusive disjunction (Or, OrElse)
Exclusive disjunction (Xor)	最低

示例：

以下示例以简单的方式演示运算符优先级：

Module assignment
   Sub Main()
      Dim a As Integer = 20
      Dim b As Integer = 10
      Dim c As Integer = 15
      Dim d As Integer = 5
      Dim e As Integer
      e = (a + b) * c / d      ' ( 30 * 15 ) / 5
      Console.WriteLine("Value of (a + b) * c / d is : {0}", e)
      e = ((a + b) * c) / d    ' (30 * 15 ) / 5
      Console.WriteLine("Value of ((a + b) * c) / d is  : {0}", e)
      e = (a + b) * (c / d)   ' (30) * (15/5)
      Console.WriteLine("Value of (a + b) * (c / d) is  : {0}", e)
      e = a + (b * c) / d     '  20 + (150/5)
      Console.WriteLine("Value of a + (b * c) / d is  : {0}", e)
      Console.ReadLine()
   End Sub
End Module

当上述代码被编译和执行时，它产生以下结果：

Value of (a + b) * c / d is : 90
Value of ((a + b) * c) / d is  : 90
Value of (a + b) * (c / d) is  : 90
Value of a + (b * c) / d is  : 50

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