Operator -= (Subtract And Assign)
 
Subtracts and assigns a value to a variable

Syntax

Declare Operator -= ( ByRef lhs As T1, ByRef rhs As T2 )
Declare Operator -= ( ByRef lhs As T Ptr, ByRef rhs As Integer )

Usage

lhs -= rhs

Parameters

lhs
The variable to assign to.
T1
Any numeric type.
rhs
The value to subtract from lhs.
T2
Any numeric type.
T
Any data type.

Description

This operator subtracts and assigns a value to a variable. It is functionally equivalent to:
lhs = lhs - rhs

For numeric types, the right-hand side expression (rhs) will be converted to the left-hand side type (T1).

This operator can be overloaded for user-defined types as a member Operator using the appropriate syntax.

Note: Similarly to the operator '=[>]' (assign), the alternative symbol '-=>' can be also used.

Example

Dim n As Double
n = 6
n -= 2.2
Print n
Sleep

Output:
3.8

Dialect Differences

  • In the -lang qb dialect, this operator cannot be overloaded.

Differences from QB

  • New to FreeBASIC

See also