{{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// [[KeyPgPointer 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.

{{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"}}