++ (increment) / — (decrement)

Description

Increment or decrement a variable

Syntax


x++; // increment x by one and returns the old value of x
++x; // increment x by one and returns the new value of x

x-- ; // decrement x by one and returns the old value of x
--x ; // decrement x by one and returns the new value of x

Parameters

x: an integer or long (possibly unsigned)

Returns

The original or newly incremented / decremented value of the variable.

Example

x = 2;
y = ++x;      // x now contains 3, y contains 3
y = x--;      // x contains 2 again, y still contains 3 

See also

+= (compound addition)
-= (compound 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.