[Compound Operators]


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


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


x: variable. Allowed data types: intfloatdoublebyteshortlong.
y: variable or constant. Allowed data types: intfloatdoublebyteshortlong.

Example Code

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

See also

  • [Language] Normal Subtraction

Language Reference Home

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.

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