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// functions4.rs
// 让我能够编译！执行 `rustex hint functions4` 获取提示 :)
// 商店正在进行促销，如果价格是偶数，可以优惠 10 Rustbucks，如果是奇数，则优惠 3 Rustbucks。
// 译：Rustbucks 可能想表达 Rust元 的意思，好比 美元 。
// I AM NOT DONE
/// 翻译: [mg-chao](https://github.com/mg-chao)
fn main() {
let original_price = 51;
println!("Your sale price is {}", sale_price(original_price));// 译："你需支付 {}"
}
fn sale_price(price: i32) -> {
if is_even(price) {
price - 10
} else {
price - 3
fn is_even(num: i32) -> bool {
num % 2 == 0
