Calculate Heart Rate Zones

heart_rate_zones.rs

/// Prints the heart rate zones assuming a 5 zones distribution with 
/// simple ranges. Adjust to your liking.
fn print_zones(resting_heart_rate: u16, max_heart_rate: u16) {
    let zones = [(50, 60), (60, 70), (70, 80), (80, 90), (90, 100)];
    let heart_rate_reserve = max_heart_rate - resting_heart_rate;

    for (index, (lower, upper)) in zones.iter().enumerate() {
        let lower = resting_heart_rate + heart_rate_reserve * lower / 100;
        let upper = resting_heart_rate + heart_rate_reserve * upper / 100;

        println!("HRZ {}: {:3}-{:3}", index + 1, lower, upper);
    }
}

fn main() {
    print_zones(45, 175);
}