A *Ruby* calculator based on string inputs; speak english... get math. Without the use of **eval**. With the correct order of precedence too

Given an piece of arithmatic expressed as a string, perform the calculation and return the value as an Integer.

A play thing.

```
require "./calc"
> calc("1 PLUS 2")
=> 3
> calc("2 PLUS 5 MINUS 1 PLUS 4")
=> 10
> calc("2 TIMES 4 MINUS 3")
=> 5
> calc("10 DIV 2 PLUS 6 MINUS 1")
=> 10
> calc("1 + 2")
=> 3
> calc("2 + 5 - 1 TIMES 4")
=> 3
```

Run tests with: `$ rake test`

Implementation taken from https://github.com/matugm/math-eval ๐

This project is available for use under the MIT software license. See LICENSE