Project Euler #1 Multiples of 3 or 5

fn main() {
    let mut sum = 0;
    for i in 1..1000 {
        if i % 3 == 0 || i % 5 == 0 {
            sum += i;
        }
    }
    println!("The sum of all the multiples of 3 or 5 below 1000 is: {}", sum);
}

This Rust code calculates the sum of all the multiples of 3 or 5 below 1000. It uses a for loop to iterate over the numbers from 1 to 999 (exclusive). The if statement checks if the current number is divisible by 3 or 5 using the modulus operator %. If it is, the number is added to the sum variable. Finally, the result is printed using the println! macro.