enum_double.rs

pub enum Number {
    Integer (usize),
    Real (f64),
    Complex(f64, f64)
}

pub fn double (num: Number) -> Number {
    match num {
        Number::Integer (n) => Number::Integer(n+n),
        Number::Real (n) => Number::Real (n+n),
        Number::Complex(r,i) => Number::Complex(r+r, i+i)
    }
}