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| pragma solidity ^0.4.0; | |
| contract BuyNccuCoin { | |
| address public minter; | |
| mapping (address => uint) public balances; | |
| event Sent(address from, address to, uint amount); | |
| function BuyNccuCoin() { | |
| minter = msg.sender; | |
| } | |
| function mint(address receiver, uint amount) returns (bool) { | |
| if (msg.sender != minter) return false; | |
| balances[receiver] += amount; | |
| return true; | |
| } | |
| function _send(address receiver, uint amount) returns (bool) { | |
| if (balances[msg.sender] < amount) return false; | |
| balances[msg.sender] -= amount; | |
| balances[receiver] += amount; | |
| Sent(msg.sender, receiver, amount); | |
| return true; | |
| } | |
| function check() constant returns (uint) { | |
| return balances[msg.sender]; | |
| } | |
| function buy() payable returns (bool) { | |
| if (msg.value <= 0) return false; | |
| //msg.value的單位一定是wei，不論傳什麼進來，都會轉成wei | |
| balances[msg.sender] += (msg.value / 1 ether); | |
| //msg.value所帶的數值，在function被執行之後，會自動被存入balance底下 | |
| //不需要手動輸入 this.send(msg.value) | |
| //contract自殺的時候，要指定收貨幣的人，若不指定，錢就再也沒辦法拿回來了 | |
| return true; | |
| } | |
| function sell(uint howMuchNccuCoin) returns (bool) { | |
| //這邊要做單位換算，可以直接乘除 1 ether 這樣的寫法 | |
| balances[msg.sender] -= howMuchNccuCoin; | |
| if (balances[msg.sender] < 0) { | |
| //出錯就呼叫throw 會rollback整個程式當做沒有執行過 | |
| throw; | |
| } | |
| //從合約送錢給msg.sender(賣貨幣的人） | |
| if (!msg.sender.send(howMuchNccuCoin * 1 ether)) { | |
| throw; | |
| } | |
| return true; | |
| } | |
| function thisContractBalance() constant returns (uint) { | |
| return this.balance / 1 ether; | |
| } | |
| function myEtherBalance() constant returns (uint) { | |
| return msg.sender.balance / 1 ether; | |
| } | |
| } |
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