if-else returns a value

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• This expersssion must have an else part!
• The last statement in both the if and the else part has no ; at the end and thus they are called expressions and not statements.

examples/booleans/if-returns-value/src/main.rs

fn main() {
    let x = 1;
    let y = 2;

    let z = if x < y { x + y } else { x * y };

    println!("{z}");
}