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20221102_发送eth.sol
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20221102_发送eth.sol
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// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;
//创建一个发送eth的合约SendEther
//创建构造函数,将该合约设置成可payable(测试没有该关键词)
//创建函数sendViaTransfer,测试transfer
//创建函数sendViaSend,测试Send,测试其返回的布尔值
//创建函数sendViaCall,测试Call,测试其返回的布尔值和data
contract SendEther {
constructor() payable {}
//为何开始要给构造函数payable呢?
//为了在创建合约时即可给该合约打币
receive() payable external {}
function sendViaTransfer(address payable _to) external payable {
_to.transfer(123);
}
function sendViaSend(address payable _to) external payable {
bool sent = _to.send(123);
require(sent, "send failed");
}
function sendViaCall(address payable _to) external payable {
(bool sent,) = _to.call{value:123}("");
require(sent, "call failed");
}
function getBal() external view returns (uint) {
return address(this).balance;
}
}
contract EthReceive {
event log(uint amount, uint gas);
receive() payable external {
emit log(msg.value, gasleft());
}
}