솔리디티 연습

MyContract.sol

pragma solidity ^0.8.3;

contract MyContract {
    address payable private owner;
    uint256 totalTokens;

    constructor() public payable {
        owner = payable(msg.sender);
        totalTokens = 1000000000000;
    }
    
    function getOwner() public view returns(address) {
        return owner;
    }
    
    function getTotalAmount() public view returns(uint256) {
        return totalTokens;
    }
    
    function deposit() public payable {}
    
    function getBalance () public view returns(uint256) {
        return address(this).balance;
    }
    
    function withdraw() public {
        uint amount = address(this).balance;
        (bool success, ) = owner.call{value: amount}("");
        require(success, "Failed to send Ether");
    }
    
    function transfer(address payable _to, uint256 _amount) public payable {
        // Note that "to" is declared as payable
        (bool success, ) = _to.call{value: _amount}(
            "return string"
        );
        require(success, "Failed to send Ether");
    }
}