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.
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

- `Operator - (Subtract)`
- Mathematical Functions