mult_vectors.rs

fn main() {
    let v1 = vec![4, 8, 12, 16];

    let v2 = mult(&v1, 10);

    pv("v1", &v1);
    pv("v2", &v2);

    println!("");
    println!("{}", v1[2]);
}

fn mult(v : &Vec<i32>, x : i32) -> Vec<i32> {
    let mut result : Vec<i32> = Vec::with_capacity(v.len());
    for val in v {
        result.push(*val * x);
    }
    result
}

fn pv(name : &str, v : &Vec<i32>) {
    let last_i = v.len() - 1;

    print!("{} = ", name);

    print!("[");
    for (i, val) in v.iter().enumerate() {
        if i == last_i {
            print!("{}", val);
        } else {
            print!("{}, ", val);
        }
    }
    print!("]\n");
}