rustlings-exercises-completed/exercises/conversions/using_as.rs

// Type casting in Rust is done via the usage of the `as` operator.
// Please note that the `as` operator is not only used when type casting.
// It also helps with renaming imports.
//
// The goal is to make sure that the division does not fail to compile
// and returns the proper type.
// Execute `rustlings hint using_as` or use the `hint` watch subcommand for a hint.

fn average(values: &[f64]) -> f64 {
    let total = values.iter().sum::<f64>();
    total / values.len() as f64
}

fn main() {
    let values = [3.5, 0.3, 13.0, 11.7];
    println!("{}", average(&values));
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn returns_proper_type_and_value() {
        assert_eq!(average(&[3.5, 0.3, 13.0, 11.7]), 7.125);
    }
}