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## += , -= , *= , /=

#### Description

Perform a mathematical operation on a variable with another constant or variable. The += (et al) operators are just a convenient shorthand for the expanded syntax, listed below.

#### Syntax

    x += y;   // equivalent to the expression x = x + y;
    x -= y;   // equivalent to the expression x = x - y;
    x *= y;   // equivalent to the expression x = x * y;
    x /= y;   // equivalent to the expression x = x / y;

#### Parameters

x: any variable type

y: any variable type or constant

#### Examples

    x = 2;
    x += 4;      // x now contains 6
    x -= 3;      // x now contains 3
    x *= 10;     // x now contains 30
    x /= 2;      // x now contains 15

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