Interface

2019 iT 邦幫忙鐵人賽

DAY 16

影片教學

Smart Contract 實戰教學系列第 16 篇

2019鐵人賽

hydai

2018-10-31 20:44:42

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昨天講了 Abstract Contract ，今天就把跟他長得很像的 Interface 吧！

本日合約:

pragma solidity ^0.4.25;

interface Animal {
    function run(uint speed) external returns (uint);
}

contract Cat is Animal {
    function run(uint speed) public returns (uint distance) {
        return speed * speed;
    }
}

contract Dog is Animal {
    function run(uint speed) public returns (uint distance) {
        return speed * 10;
    }
}

本日影片:
https://youtu.be/8EYpLwQm5fg

Smart Contract 實戰教學播放清單：
https://www.youtube.com/playlist?list=PLHmOMPRfmOxSJcrlwyandWYiuP9ZAMYoF