First program written in Rust to convert degree between Farenheit (F) and Celcius (C)

convert_between_farenheit_and_celcius.rs

use std::io;

fn main() {
    println!("Please choose mode:");
    println!("1> C degree to F degree ");
    println!("2> F degree to C degree ");

    let mut mode = String::new();

    loop {
        io::stdin().read_line(&mut mode).expect("Fail to read line");
        mode = mode.trim().to_string();
        if mode == "1" || mode == "2" {
            break
        } else {
            mode = String::new();
            continue;
        }
    }

    let mut input = String::new();

    if mode == "2" {
        println!("Please input farenheit and let us convert it to celcius!");
        io::stdin().read_line(&mut input).expect("Input is not a number");
        let input: i32 = input.trim().parse().expect("Cannot convert to number");
        println!("The celcius is {}", f_to_c(input));
    } else {
        println!("Please input celcius and let us convert it to farenheit!");
        io::stdin().read_line(&mut input).expect("Input is not a number");
        let input: i32 = input.trim().parse().expect("Cannot convert to number");
        println!("The farenheit is {}", c_to_f(input));
    }
}

fn f_to_c(f: i32) -> i32{
    (f - 32) * 5 / 9
}

fn c_to_f(c: i32) -> i32{
    c * 9 / 5 + 32
}

The binary file is here, download and give it a try!