The Ultimate Guide to Rust Programming/

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And/Or

And/Or

We'll cover the following...

Let’s say I’m selling movie tickets and we give a discount to people under 18, as well as to people 65 and older. I’d like to write a function gets_discount(). I can state the requirement in almost-code as age < 18 OR age >= 65. Unfortunately, that OR isn’t real Rust code. Instead, it’s time to introduce the or operator, which is two pipes || (hold shift and hit the backslash key on most keyboards).

Exercise

Implement the gets_discount function correctly to make this program pass.

Rust 1.40.0
fn gets_discount(age: u32) -> bool {
    unimplemented!() // replace this!
}
fn main() {
    // Kids
    assert_eq!(gets_discount(7), true);
    assert!(gets_discount(8));
    assert!(gets_discount(17));
    // Adults
    assert_eq!(gets_discount(18), false);
    assert!(!gets_discount(30));
    assert!(!gets_discount(64));
    // Seniors
    assert!(gets_discount(65));
    assert!(gets_discount(70));
    println!("Success!");
}

The or operator is binary, so it takes two values. I’ll explain this the same way I explained or above.

  1. If either or both values are true, it evaluates ...