#Rust Functions

fn main() {
    println!("Hello, world!");

    another_function();
    function_with_parameter(5);
    print_labeled_measurement(5, 'h');

    let x = five();
    println!("The value of x is: {}", x);

    let x = plus_one(5);
    println!("The value of x is: {}", x);
}

fn another_function() {
    println!("Another function.");
}

fn function_with_parameter(x: i32) {
    println!("The value of x is: {}", x);
}

fn print_labeled_measurement(value: i32, unit_label: char) {
    println!("The measurement is: {}{}", value, unit_label);
}

fn five() -> i32 {
    5
}

fn plus_one(x: i32) -> i32 {
    x + 1
}

fn add_one(x: i32) -> i32 {
    x + 1
}

fn do_twice(f: fn(i32) -> i32, arg: i32) -> i32 {
    f(arg) + f(arg)
}

fn main() {
    let answer = do_twice(add_one, 5);
    println!("The answer is: {}", answer);
}