The += assignment operator adds a given
numeric expression and assigns it to the given variable.

## Syntax

`variable` += `num.exp`

## Example(s)

Adds `1` to the
variable, `x`.

x += 1

The statement below:

total += tax

is equivalent of the statement:

total = total + tax

## See also

* arithmetic operator, *= assignment operator, - arithmetic operator, -= assignment operator, /= assignment operator, := assignment operator, Arithmetic expressions, Arithmetic operators, Assignment, Numeric expressions, Precedence, precision statement, Relational operators, sum() function, \= assignment operator