use std::io;

fn main() {
    println!("Fahrenheit to Celsius Converter");
    println!("Enter temperature in Fahrenheit");

    let mut temp = String::new();

    io::stdin().read_line(&mut temp)
        .expect("Failed to read line");

    let  input_temp: f64 = temp.trim().parse()
        .expect("Input must be a number");

    let converted = f_to_c(input_temp);

    println!("{}°F is {}°C", input_temp, converted);
}

fn f_to_c(fahrenheit: f64) -> f64 {
    (fahrenheit - 32.0) / 1.8
}