Demonstrates a case where one has to use mutable variables in Rust

euler1.rs

// Solution to Project Euler problem 1,
// https://projecteuler.net/problem=1
fn main() {
    let (i, result) = (0i, 0i);

    while i < 1000 {
        if i%3 == 0 || i%5 == 0 { result += i }
        i += 1
    }
    println!("{}", result);
}