percentage.rs

#[inline(never)]
fn stylo(intpart: &[u32], fracpart: &[u32]) -> f32 {
    let mut integral = 0.0f64;
    let mut fractional = 0.0f64;
    let mut factor = 0.1;
    for i in intpart {
        integral = integral * 10. + *i as f64;
    }
    for i in fracpart {
        fractional += *i as f64 * factor;
        factor *= 0.1;
    }
    1. *(integral + fractional) as f32 / 100.
}

#[inline(never)]
fn gecko(intpart: &[u32], fracpart: &[u32]) -> f32 {
    let mut integral = 0;
    let mut fractional = 0.0f64;
    let mut divisor = 10.;
    for i in intpart {
        integral = integral * 10 + *i;
    }
    for i in fracpart {
        fractional += *i as f64 / divisor;
        divisor *= 10.;
    }
    (((integral as f64) + fractional) / 100.) as f32
}

fn main(){
    let intpart = [4, 7];
    let fracpart = [9, 9, 5];

    println!("{:.10} {:.10}", stylo(&intpart, &fracpart) * 100., gecko(&intpart, &fracpart) * 100.);

    println!("{:.10} {:.10}", 47.995f64 as f32 / 100., (47.995f64 / 100.) as f32);
}