fn square(x: f64) -> f64 {
    return x * x;
}

fn add_floats(a: f64, b: f64) -> f64 {
    return a + b;
}

fn main() -> i64 {
    let s: f64 = square(3.0);
    let sum: f64 = add_floats(s, 4.0);
    print_f64(sum);
    return 0;
}