Arduino

Buy | Download | Getting Started | Learning | Reference | Hardware | FAQ

Blog » | Forum » | Playground »

Reference Language (extended) | Libraries | Comparison | Board

## ++ (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.

#### Examples

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

#### See also

+=
-=

Reference Home

Corrections, suggestions, and new documentation should be posted to the Forum.

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

Edit Page | Page History | Printable View | All Recent Site Changes