Handle overflow and underflow - checked

• checked_add

• checked_add

• Returns and Option that, is either the incremented value wrapped in Some or None.

fn main() {
    let mut num: i8 = 126;
    println!("{num}");

    num = num.checked_add(1).unwrap_or(42);
    println!("{num}");

    num = num.checked_add(1).unwrap_or(42);
    println!("{num}");
}

126
127
42