# CLI calculation tools
> `rfcalc` stands for "R4 Calculations". R4 is my self representaion =_=
## Usage
- `rfcalc factorial <NUM>`: Calculate the factorial of a number (max: 20)
- `rfcalc hw <NUM>`: Calculate the Hamming weight of a binary number
- `refcalc c <N> <K>`: Calculate the combination of `N` choose `K`