-=

[Compound Operators]

Description

This is a convenient shorthand to perform subtraction of a constant or a variable from a variable.

Syntax

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

Parameters

x: variable. Allowed data types: int, float, double, byte, short, long.
y: variable or constant. Allowed data types: int, float, double, byte, short, long.

Example Code

x = 20;
x -= 2; // x now contains 18

See also

• [Language] Normal Subtraction

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The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.