2.3 FizzBuzz

This example is not the traditional FizzBuzz; instead it is the smart contract version! A script can call the fizzbuzz ABI method of this contract with some u64 value and receive back its fizzbuzzability as an enum.

这个例子不是传统的 FizzBu​​zz；相反，它是智能合约的版本！脚本可以使用一些 u64 值调用此合约的 fizzbuzz ABI 方法，并将其 fizzbuzzability 作为 enum 返回。

The format for custom structs and enums such as FizzBuzzResult will be automatically included in the ABI JSON so that off-chain code can handle the encoded form of the returned data.

FizzBu​​zzResult 等自定义结构和枚举的格式，将自动包含在 ABI JSON 中，以便链下代码可以处理返回数据的编码形式。

contract;

enum FizzBuzzResult {
    Fizz: (),
    Buzz: (),
    FizzBuzz: (),
    Other: u64,
}

abi FizzBuzz {
    fn fizzbuzz(input: u64) -> FizzBuzzResult;
}

impl FizzBuzz for Contract {
    fn fizzbuzz(input: u64) -> FizzBuzzResult {
        if input % 15 == 0 {
            FizzBuzzResult::FizzBuzz
        } else if input % 3 == 0 {
            FizzBuzzResult::Fizz
        } else if input % 5 == 0 {
            FizzBuzzResult::Buzz
        } else {
            FizzBuzzResult::Other(input)
        }
    }
}