Arduino - Int

Arduino

Guide

Tutorials

Reference

Hardware

Software

Forum

Playground

Exhibition

Hacking

FAQ

Buy

Language | Libraries | Comparison

## int

#### Description

Integers are your primary datatype for number storage, and store a 2 byte value. This yields a range of -32,768 to 32,767 (minimum value of -2^15 and a maximum value of (2^15) - 1).

Int's store negative numbers with a technique called 2's complement math. The highest bit, sometimes refered to as the "sign" bit, flags the number as a negative number. The rest of the bits are inverted and 1 is added.

The Arduino takes care of dealing with negative numbers for you, so that arithmetic operations work transparently in the expected manner. There can be an unexpected complication in dealing with the bitshift right operator (>>) however.

#### Example

        int ledPin = 13;

#### Syntax

        int var = val;

- var - your int variable name
- val - the value you assign to that variable

#### Coding Tip

When variables are made to exceed their maximum capacity they "roll over" back to their minimum capacitiy, note that this happens in both directions

       int x
       x = -32,768;
       x = x - 1;       // x now contains 32,767 - rolls over in neg. direction

       x = 32,767;
       x = x + 1;       // x now contains -32,768 - rolls over

#### See Also

- byte
- unsigned int
- long
- unsigned long

Reference Home

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

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