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use std::io;
use std::process;
fn read_input() -> i32 {
let mut input = String::new();
io::stdin()
.read_line(&mut input)
.expect("failed to read line");
let input = match input.trim().parse() {
Ok(input) => input,
Err(_) => {
println!("not a number!");
process::exit(1);
},
};
input
}
fn main() {
println!("Convert temperatures between Fahrenheit and Celsius");
println!("");
loop {
println!("Please choose converting method:");
println!("1) Fahrenheit to Celsius 2) Celsius to Fahrenheit");
println!("3) exit");
let choice = read_input();
if choice == 0 {
let _choice = read_input();
} else if choice == 1 {
fah_to_cel();
} else if choice == 2 {
cel_to_fah();
} else if choice == 3 {
break
};
}
println!("Thinks for using");
}
fn fah_to_cel() {
println!("Please enter a Fahrenheit temperature");
let fah = read_input() as f32;
println!("the Celsius of {fah} is {}", (fah-32.0)/1.8);
println!("");
}
fn cel_to_fah() {
println!("Please enter a Celsius temperature");
let cel = read_input() as f32;
println!("The Fahrenteit of {cel} is {}", cel*1.8+32.0);
println!("");
}
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