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Contract Source Code:
File 1 of 1 : FXX_contract
pragma solidity ^0.5.2; contract ERC20Interface { string public name; string public symbol; uint8 public decimals; uint public totalSupply; function transfer(address _to, uint256 _value) public returns (bool success); function transferFrom(address _from, address _to, uint256 _value) public returns (bool success); function approve(address _spender, uint256 _value) public returns (bool success); function allowance(address _owner, address _spender) public view returns (uint256 remaining); event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); } contract FXX_contract is ERC20Interface { mapping (address => uint256) public balanceOf; mapping (address => mapping (address => uint256) ) internal allowed; constructor() public { name = "Mation Chain"; symbol = "Main"; decimals = 18; // 发币10亿,再加小数位4个0。 totalSupply = 1000000000000000000000000000; balanceOf[msg.sender] = totalSupply; } function transfer(address _to, uint256 _value) public returns (bool success){ require(_to != address(0)); require(balanceOf[msg.sender] >= _value); require(balanceOf[_to] + _value >= balanceOf[_to]); balanceOf[msg.sender] -= _value; balanceOf[_to] += _value; emit Transfer(msg.sender, _to, _value); success = true; } function transferFrom(address _from, address _to, uint256 _value) public returns (bool success){ require(_to != address(0)); require(balanceOf[_from] >= _value); require(allowed[_from][msg.sender] >= _value); require(balanceOf[_to] + _value >= balanceOf[_to]); balanceOf[_from] -= _value; balanceOf[_to] += _value; allowed[_from][msg.sender] -= _value; emit Transfer(_from, _to, _value); success = true; } function approve(address _spender, uint256 _value) public returns (bool success){ require((_value == 0)||(allowed[msg.sender][_spender] == 0)); allowed[msg.sender][_spender] = _value; emit Approval(msg.sender, _spender, _value); success = true; } function allowance(address _owner, address _spender) public view returns (uint256 remaining){ return allowed[_owner][_spender]; } }
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