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The Ultimate Guide to Rust Programming

Counting

Explore counting techniques in Rust using mutable variables and while loops. Understand common off-by-one errors and how to correct them. This lesson helps you predict loop outputs and prepares you to transition to more efficient loops.

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One of the most common bugs in computer programming is an off-by-one error. Oftentimes, we end up writing programs that do either one too many, or one too few times. Let’s see if you can predict the output of this program:

Rust 1.40.0
fn main() {
    let mut i = 1;
    while i < 10 {
        println!("i == {}", i);
        i += 1;
    }
}

It kind ...