Function getPrecision

getPrecision(n?: number): number
gets the precision of a number (how many decimal digits)
Parameters
- n: number = 0
Returns number
Example
```
getPrecision(2.1)   //1
getPrecision(9.65)  //2
getPrecision(0.479) //3
getPrecision(1) //0
getPrecision(0) //0
```
- Defined in math.ts:99