extern crate decimal;

use decimal::*;

fn main() {
    let a = 0.3;
    let b = 0.2;
    let c = 0.1;
    let r = a - b - c;
    println!("{:?}", r); // -> -0.000000000000000027755575615628914

    let a = d128!(0.3);
    let b = d128!(0.2);
    let c = d128!(0.1);
    let r = a - b - c;
    println!("{:?}", r); // -> 0.0
}