Yet another Fahrenheit and Celsius converter

Question

Introduction

I am recently learning Rust by reading The Rust Programming Language (a.k.a. the book). I have finished the first three chapters so far, and this is my attempt for the first exercise listed at the end of Chapter 3, which has a simple description:

Convert temperatures between Fahrenheit and Celsius.

My program repetitively prompts the user to input for a command (one of \${^{\circ}\text{F}} \to {^{\circ}\text{C}}\$, \${^{\circ}\text{C}} \to {^{\circ}\text{F}}\$, and quit), and asks for temperature values to be converted as floating-point values. If the user input cannot be properly interpreted, the program sends an error message and resumes executing if possible.

I have run rustfmt and clippy on my program. rustfmt taught me something new (removing , after {} in a match expression), and clippy did not report any problems. I have also tested the program with different inputs, and so far it seems to work properly.

Before moving on, I would like to know whether I am in the right direction. Feel free to point out edge cases I neglected, failures to conform to received Rust guidelines, or other things that I did wrong, so I can correct these mistakes as soon as possible and learn productively in the future.

Code

src/main.rs

use std::io;

fn main() {
    println!("This is a program that converts temperatures between Fahrenheit and Celsius.");

    loop {
        println!("\nEnter one of the following commands:");
        println!(" - 0: convert from Fahrenheit to Celsius");
        println!(" - 1: convert from Celsius to Fahrenheit");
        println!(" - 2: quit");

        let mut command = String::new();
        match io::stdin().read_line(&mut command) {
            Ok(_) => {}
            Err(_) => {
                println!("Failed to read command.");
                continue;
            }
        }

        let command: u32 = match command.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                println!("Invalid command.");
                continue;
            }
        };
        match command {
            0 => fahrenheit_to_celsius(),
            1 => celsius_to_fahrenheit(),
            2 => break,
            _ => println!("Invalid command."),
        }
    }
}

fn fahrenheit_to_celsius() {
    println!("Enter the temperature in Fahrenheit.");

    let mut temperature = String::new();
    match io::stdin().read_line(&mut temperature) {
        Ok(_) => {}
        Err(_) => {
            println!("Failed to read temperature.");
            return;
        }
    }

    let temperature: f64 = match temperature.trim().parse() {
        Ok(t) => t,
        Err(_) => {
            println!("Invalid temperature.");
            return;
        }
    };
    let converted = (temperature - 32.0) / 1.8;
    println!("{} Fahrenheit = {} Celsius", temperature, converted);
}

fn celsius_to_fahrenheit() {
    println!("Enter the temperature in Celsius.");

    let mut temperature = String::new();
    match io::stdin().read_line(&mut temperature) {
        Ok(_) => {}
        Err(_) => {
            println!("Failed to read temperature.");
            return;
        }
    }

    let temperature: f64 = match temperature.trim().parse() {
        Ok(t) => t,
        Err(_) => {
            println!("Invalid temperature.");
            return;
        }
    };
    let converted = temperature * 1.8 + 32.0;
    println!("{} Celsius = {} Fahrenheit", temperature, converted);
}

Cargo.toml

[package]
name = "temperature"
version = "0.1.0"
authors = ["L. F."]
edition = "2018"

[dependencies]

Example session

Here's an example cargo run session:

This is a program that converts temperatures between Fahrenheit and Celsius.

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
0
Enter the temperature in Fahrenheit.
200
200 Fahrenheit = 93.33333333333333 Celsius

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
0
Enter the temperature in Fahrenheit.
123.4
123.4 Fahrenheit = 50.77777777777778 Celsius

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
0
Enter the temperature in Fahrenheit.
cat
Invalid temperature.

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
1
Enter the temperature in Celsius.
1.98e5
198000 Celsius = 356432 Fahrenheit

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
1
Enter the temperature in Celsius.
unicorn
Invalid temperature.

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
3
Invalid command.

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
dog
Invalid command.

Enter one of the following commands:
 - 0: convert from Fahrenheit to Celsius
 - 1: convert from Celsius to Fahrenheit
 - 2: quit
2