calc_engine

This Engine transforms a string representation of a Math expression to the actual result of the expression.

I'm using the top-down recursive descent parsing techque. (Input is read from Left -> Right)

How to use.

```rs

use calc_engine;

func main() { let res = calcengine::calculate("1 + 1")?; let errormargin = f64::EPSILON; assert!((result - 2.0).abs() < error_margin);

let res = calc_engine::calculate("(1 + 1) + 3")?;

}

```

Still to be done

• [ ] Bug fixes
• [ ] Logarithmic expressions
• [ ] More tests..

Not in any particular order.