Challenge 3

Now, we are putting everything together. Do you remember how to comment? // is for a line-comment, where /* and */ encloses a multi-line comment. Answers will definitely vary, but the below solution works.

fn main() {

    // 3.
    println(sub(8, 5));

    /* 7. */
    println(sub(17, 9, 1));

    /*
        5.
    */
    println(sub(12, 14, -7, 0));

}

Output:

3
7
5