Declare Operator - ( ByRef lhs As Byte, ByRef rhs As Byte ) As Byte
Declare Operator - ( ByRef lhs As UByte, ByRef rhs As UByte ) As UByte
Declare Operator - ( ByRef lhs As Short, ByRef rhs As Short ) As Short
Declare Operator - ( ByRef lhs As UShort, ByRef rhs As UShort ) As UShort
Declare Operator - ( ByRef lhs As Integer, ByRef rhs As Integer ) As Integer
Declare Operator - ( ByRef lhs As UInteger, ByRef rhs As UInteger ) As UInteger
Declare Operator - ( ByRef lhs As LongInt, ByRef rhs As LongInt ) As LongInt
Declare Operator - ( ByRef lhs As ULongInt, ByRef rhs As ULongInt ) As ULongInt

Declare Operator - ( ByRef lhs As Single, ByRef rhs As Single ) As Single
Declare Operator - ( ByRef lhs As Double, ByRef rhs As Double ) As Double

Declare Operator - ( ByRef lhs As T Pointer, ByRef rhs As T Pointer ) As Integer
Declare Operator - ( ByRef lhs As T Pointer, ByRef rhs As Integer ) As T Pointer

Declare Operator - ( ByRef lhs As T , ByRef rhs As T ) As Integer
Declare Operator - ( ByRef lhs As T , ByRef rhs As Integer ) As T
Declare Operator - ( ByRef lhs As Integer, ByRef rhs As T ) As T

result = lhs - rhs

lhs
rhs
T

返回两个表达式的减法。

当左和右侧表达式是数值时，操作符 -（减）返回两个值的减法。

如果左侧和右侧的表达式都是T Pointer类型，对于某些类型T ，操作符对地址执行指针减法，返回结果。这与数字减法不同，因为差值除以SizeOf( T ).

如果从T Pointer类型中减去积分值n ，则操作符对地址执行指针运算，返回T 值前的n 索引的存储位置（假设(-n) 在T 值的连续数组）。这与数字减法的行为不同，因为Integer的值按SizeOf( T )缩放。

任何操作数都不会被修改。

该操作符可以被重载以接受用户定义的类型。

Dim n As Single
n = 4 - 5
Print n

将产生输出：

-1

• 在-lang qb 方言中，此运算符无法重载。
  
  

• 没有
  
  

• 数学函数