# decimal

Simple decimal arithmetic for the browser and node.js!

## Stats

StarsIssuesVersionUpdatedCreatedSize
decimal
4870.0.211 years ago11 years ago

## Readme

Decimal
Simple decimal arithmetic for the browser and node.js!
Why?
``````Why don’t my numbers, like 0.1 + 0.2 add up to a nice round 0.3,
and instead I get a weird result like 0.30000000000000004?

Because internally, computers use a format (binary floating-point)
that cannot accurately represent a number like 0.1, 0.2 or 0.3 at all.``````
Source : http://floating-point-gui.de/
I wrote this because I needed to do simple computation in the browser and I couldn't find a lightweight library to do it.
How to use?

## In the browser

``<script src="lib/decimal.js"></script>``

## In node

``npm install decimal``
then in your program
``var Decimal = require('decimal');``
Examples
``````>>> 1.1 + 2.2
3.3000000000000003

>>> Decimal('1.1').add('2.2').toNumber()
3.3

>>> 4.01 * 2.01
8.060099999999998

>>> Decimal('4.01').mul('2.01').toNumber()
8.0601

>>> Decimal.mul('4.01', '2.01').toNumber()
8.0601``````
Can I help?
Of course you can, I suck at math, and this implementation is very naive. If you are a math Guru and you see something wrong or a way to simplify things you can send in a pull request.
Methods

## Decimal(n)

Create a new `Decimal` from `n`. `n` can be a string, integer, or another `Decimal`.

## .toString()

Returns the `Decimal` instance as a string.

## .toNumber()

Turn a `Decimal` into a `Number`.

## .add(n)

Return a new `Decimal` containing the instance value plus `n`.

## .sub(n)

Return a new `Decimal` containing the instance value minus `n`.

## .mul(n)

Return a new `Decimal` containing the instance value multiplied by `n`.

## .div(n)

Return a new `Decimal` containing the instance value integrally divided by `n`.