Recapitulação - If Else

use std::io;

fn main() {
    let mut n1_input = String::new();
    let mut n2_input = String::new();
    let mut op_input = String::new();
    
    io::stdin().read_line(&mut n1_input).unwrap();
    io::stdin().read_line(&mut n2_input).unwrap();
    io::stdin().read_line(&mut op_input).unwrap();
    
    let n1: f64 = n1_input.trim().parse().unwrap();
    let n2: f64 = n2_input.trim().parse().unwrap();
    let op = op_input.trim();
    
    // Escreva seu código abaixo, use n1, n2 e op
    let result: f64 = 0.0;
    
    
    
    println!("{}", result);
}