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August 25, 2021 02:22
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| pragma solidity ^0.6.0; | |
| import "./erc20.sol"; | |
| contract pcCoin is ERC20 { | |
| address public _owner; | |
| uint256 _totalSupply; | |
| mapping(address=>uint256) _balances; | |
| mapping(address=>mapping(address=>uint256)) _approves; | |
| event Transfer(address indexed _tran, address indexed _to, uint _value); | |
| event Approval(address indexed _owner, address indexed _spender, uint _value); | |
| constructor(uint256 totalSupply) public { | |
| _totalSupply = totalSupply; | |
| _owner = msg.sender; | |
| } | |
| modifier onlyOwner() { | |
| require(msg.sender == _owner); | |
| _; | |
| } | |
| function airDrop(address _to, uint256 _value) onlyOwner public { | |
| require(_to != address(0) && _value > 0); | |
| _balances[_to] += _value; | |
| _totalSupply += _value; | |
| } | |
| function totalSupply() override public view returns(uint256 totalSupply) { | |
| totalSuppy = totalSupply; | |
| return totalSupply; | |
| } | |
| function balanceOf(address _owner) override public view returns(uint balance) { | |
| require(_owner != address(0), "owner should not be empty!"); // address(0) 空地址 | |
| return _balances[_owner]; | |
| } | |
| function transfer(address _to, uint _value) override public returns(bool success) { | |
| require(_to != address(0), "_to should not be empty!"); | |
| require(_balances[msg.sender] >= _value || _value > 0, "value should be valid!!"); | |
| _balances[msg.sender] -= _value; | |
| _balances[_to] += _value; | |
| success = true; | |
| emit Transfer(msg.sender, _to, _value); | |
| return success; | |
| } | |
| function transferFrom(address _from, address _to, uint _value) override public returns(bool success) { | |
| require(_from != address(0) && _to != address(0)); | |
| require(_approves[_from][msg.sender] >= _value); | |
| _approves[_from][msg.sender] -= _value; | |
| _balances[_to] += _value; | |
| emit Transfer(_from, _to, _value); | |
| success = true; | |
| return success; | |
| } | |
| function approve(address _spender, uint _value) override public returns(bool success) { | |
| require(_spender != address(0)); | |
| require(_balances[msg.sender] >= _value || _value>0); | |
| _approves[msg.sender][_spender] += _value; | |
| _balances[msg.sender] -= _value; | |
| emit Approval(msg.sender, _spender, _value); | |
| success = true; | |
| return success; | |
| } | |
| function allowance(address _owner, address _spender) override public view returns(uint remaining) { | |
| remaining = _approves[_owner][_spender]; | |
| return remaining; | |
| } | |
| } |
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