smart contracts
先来一段合约代码：
// MetaCoin.sol 用于账户转账的智能合约应用
contract MetaCoin {
mapping (address => uint) balances;
function MetaCoin() {
balances[tx.origin] = 10000;
}
function sendCoin(address receiver, uint amount) returns(bool sufficient) {
if (balances[msg.sender] < amount) return false;
balances[msg.sender] -= amount;
balances[receiver] += amount;
return true;
}
function getBalance(address addr) returns(uint) {
return balances[addr];
}
}
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