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: int, float, double, byte, short, long
y: variable or constant. Allowed data types: int, float, double, byte, short, long
x = 20;
x -= 2; // x now contains 18Corrections, suggestions, and new documentation are very welcomed. They can be contributed to the energia website repository on Github.
The text of the Energia getting started and reference guides are licensed under a Creative Commons Attribution-ShareAlike 3.0 License. The Energia reference is based on the Wiring/Arduino reference. Code samples in the guide are released into the public domain.
Energia sketches are C/C++ based and compiled with the open-source compiler MSPGCC or arm-gcc-none-eabi. The Energia language comes from Wiring. The Energia environment is based on Processing and includes modifications made by Wiring and Arduino.
© Energia