A quick reimplementation of a calorie counter program written in C++ now in Rust.

calorie_counter.rs

use std::io;

fn main() {

    const KILO_PER_POUND:f32 = 2.2;
    const CALORIE_BURN_RATE:f32 = 0.0175;

    println!("Input your weight in pounds: ");

    let mut weight_in_pounds = String::new();
    io::stdin().read_line(&mut weight_in_pounds).expect("Please input a valid string");

    let weight_in_pounds:f32 = weight_in_pounds.trim().parse().expect("Weight is not a number");
    let weight_in_kilos = weight_in_pounds / KILO_PER_POUND;

    println!("Input metabolic equivalent rate: ");

    let mut metabolic_rate = String::new();
    io::stdin().read_line(&mut metabolic_rate).expect("Please input a valid string");

    let metabolic_rate:f32 = metabolic_rate.trim().parse().expect("Metabolic rate is not a number");

    println!("Input time spent, in minutes: ");
    let mut time_in_minutes = String::new();
    io::stdin().read_line(&mut time_in_minutes).expect("Please input a valid string");

    let time_in_minutes: f32 = time_in_minutes.trim().parse().expect("Time is not a number");

    let calorie_rate = CALORIE_BURN_RATE * metabolic_rate * weight_in_kilos;
    let total_calories_burned = calorie_rate * time_in_minutes;

    println!("You burned a total of {} at a rate of {} per minute.", total_calories_burned, calorie_rate);
}