Operator -= (Subtract and Assign)

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgOpCombineSub
• Last revised: 2019-09-27

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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.

Examples

start GeSHi

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

end GeSHi

Output:

3.8

Dialect Differences

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

Differences from QB

• New to FreeBASIC

See also

• Operator - (Subtract)
• Mathematical Functions

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