Match: do several things when a condition i matched

[Gorilla1]

Hello, is it possible to do two actions when a matching occurs? As it is now my script runs as an indefinite loop.

Part of my code:

		let input_string: i32 = match input_string.trim().parse() {
				Ok(num) => num,
				Ok(num) => break,
				Err(_) => continue,
			};

Here is my entire code, trouble begins at line 36 I think.

use std::io;

fn main() {
	
		let mut celcius = 0.0;
		let mut farenheit = 0.0;
		
		let mut input_i32:i32 = 0;
		
		println!("Please enter 0 for farenheit, 1 for celcius.");
		input_i32 = read_input_line_i32();
		
		
		if input_i32 == 1
		{
			println!("Converting from celcius to farenheit");
			println!("Enter celcius")
				
				
		} else {
			println!("Converting from farenheit to celcius");
		}
	
}

fn read_input_line_i32 () -> i32 {
	let mut input_string = String::new();
	
	loop {
		println!("Enter number:");
		
		io::stdin()
		.read_line(&mut input_string)
		.expect("Failed to read line");
		
		let input_string: i32 = match input_string.trim().parse() {
				Ok(num) => num,
				Ok(num) => break,
				Err(_) => continue,
			};
	}
	
	let return_i32: i32 = input_string.parse::<i32>().unwrap();
	return return_i32;

}

[alice]

The way you do multiple things is as follows:

let input_string: i32 = match input_string.trim().parse() {
    Ok(num) => {
        println!("The first thing");
        println!("The second thing");
        
        // finally the expression that becomes the value of `input_string`
        num
    },
    Err(_) => continue,
};

However in your case, you will need some additional restructuring to do what you wanted. The most direct fix seems to return early:

fn read_input_line_i32() -> i32 {
    let mut input_string = String::new();

    loop {
        println!("Enter number:");

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

        match input_string.trim().parse() {
            Ok(num) => {
                return num;
            },
            Err(_) => continue,
        }
    }
}

Unrelated, but I strongly encourage you to run your code through the rustfmt tool, which will automatically fix the indentation of your code.

[droundy]

Looks to me like it builds. What is the error you're seeing?

Also note that the playground is a great resource when asking questions.

[visig]

In OP's code second match arm Ok(num) => break are never reachable and cause a infinite loop.

Other thing I noticed is it try to parse() twice, that are not necessary.