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{{fbdoc item="title" value="Operator += (Add and Assign)"}}----
Adds and assigns a value to a variable

{{fbdoc item="syntax"}}##
[[KeyPgDeclare|declare]] [[KeyPgOperator|operator]] **+=** ( [[KeyPgByref|byref]] //lhs// [[KeyPgAs|as]] //T1//, [[KeyPgByref|byref]] //rhs// [[KeyPgAs|as]] //T2// )

[[KeyPgDeclare|declare]] [[KeyPgOperator|operator]] **+=** ( [[KeyPgByref|byref]] //lhs// [[KeyPgAs|as]] //T// [[KeyPgPtr|ptr]], [[KeyPgByref|byref]] //rhs// [[KeyPgAs|as]] [[KeyPgInteger|integer]] )

[[KeyPgDeclare|declare]] [[KeyPgOperator|operator]] **+=** ( [[KeyPgByref|byref]] //lhs// [[KeyPgAs|as]] [[KeyPgString|string]], [[KeyPgByref|byref]] //rhs// [[KeyPgAs|as]] [[KeyPgString|string]] )
[[KeyPgDeclare|declare]] [[KeyPgOperator|operator]] **+=** ( [[KeyPgByref|byref]] //lhs// [[KeyPgAs|as]] [[KeyPgWstring|wstring]], [[KeyPgByref|byref]] //rhs// [[KeyPgAs|as]] [[KeyPgWstring|wstring]] )
##
{{fbdoc item="usage"}}##
//lhs// **+=** //rhs//
##
{{fbdoc item="param"}}
##//lhs//##
The variable to assign to.
##//T1//##
Any numeric type.
##//rhs//##
The value to add to ##//lhs//##.
##//T2//##
Any numeric type.
##//T//##
Any data type.

{{fbdoc item="desc"}}
This operator adds and assigns a value to a variable. It is functionally equivalent to:
##
//lhs// = //lhs// [[KeyPgOpAdd|+]] //rhs//
##
For numeric types, the right-hand side expression (##//rhs//##) will be converted to the left-hand side type (##//T1//##).

For string types, this operator is functionally equivalent to ##[[KeyPgOpCombineConcat|Operator &= (Concatenate and assign)]]##.

This operator can be overloaded for user-defined types as a member ##[[KeyPgOperator|Operator]]## using the appropriate syntax.

{{fbdoc item="ex"}}
{{fbdoc item="filename" value="examples/manual/operator/add-assign.bas"}}%%(freebasic)
DIM n AS DOUBLE
n = 6
n += 1
PRINT n
SLEEP
%%
Output:
%%
7
%%

{{fbdoc item="lang"}}
- In the //[[CompilerOptlang|-lang qb]]// dialect, this operator cannot be overloaded.

{{fbdoc item="diff"}}
- New to ""FreeBASIC""

{{fbdoc item="see"}}
- ##[[KeyPgOpAdd|Operator + (Add)]]##
- [[CatPgMath|Mathematical Functions]]

{{fbdoc item="back" value="CatPgOpAssignment|Assignment Operators"}}{{fbdoc item="back" value="CatPgOperators|Operators"}}
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