Created
January 17, 2019 07:50
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| pragma solidity ^0.4.24; | |
| contract ERC20Interface { | |
| function totalSupply() public constant returns (uint); | |
| function balanceOf(address tokenOwner) public constant returns (uint balance); | |
| function allowance(address tokenOwner, address spender) public constant returns (uint remaining); | |
| function transfer(address to, uint tokens) public returns (bool success); | |
| function approve(address spender, uint tokens) public returns (bool success); | |
| function transferFrom(address from, address to, uint tokens) public returns (bool success); | |
| event Transfer(address indexed from, address indexed to, uint tokens); | |
| event Approval(address indexed tokenOwner, address indexed spender, uint tokens); | |
| } | |
| contract TokenERC20 { | |
| string public name; | |
| string public symbol; | |
| uint8 public decimals = 18; | |
| uint256 public totalSupply; | |
| mapping (address => uint256) public balances; | |
| mapping (address => mapping (address => uint256)) public allowed; | |
| event Transfer(address indexed from, address indexed to, uint256 value); | |
| event Approval(address indexed owner, address indexed spender, uint256 value); | |
| constructor ( | |
| uint8 initialSupply, | |
| string tokenName, | |
| string tokenSymbol | |
| ) public { | |
| totalSupply = initialSupply; | |
| balances[msg.sender] = initialSupply; | |
| name = tokenName; | |
| symbol = tokenSymbol; | |
| } | |
| function totalSupply() public view returns (uint256) { | |
| return (totalSupply); | |
| } | |
| function baranceOf(address _owner) public view returns (uint256) { | |
| return (balances[_owner]); | |
| } | |
| function _transfer(address _from, address _to, uint _value) internal { | |
| require(_to != 0x0); | |
| require(balances[_from] >= _value); | |
| require(balances[_to] + _value > balances[_to]); | |
| uint previousBalances = balances[_from] + balances[_to]; | |
| balances[_from] -= _value; | |
| balances[_to] += _value; | |
| emit Transfer(_from, _to, _value); | |
| assert(balances[_from] + balances[_to] == previousBalances); | |
| } | |
| function transfer(address _to, uint256 _value) public { | |
| _transfer(msg.sender, _to, _value); | |
| } | |
| function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { | |
| require(_value <= allowed[_from][msg.sender]); | |
| allowed[_from][msg.sender] -= _value; | |
| _transfer(_from, _to, _value); | |
| return true; | |
| } | |
| function approve(address _spender, uint256 _value) public | |
| returns (bool success) { | |
| allowed[msg.sender][_spender] = _value; | |
| emit Approval(msg.sender, _spender, _value); | |
| return true; | |
| } | |
| function allowance(address _owner, address _spender) public view returns (uint256) { | |
| return (allowed[_owner][_spender]); | |
| } | |
| } | |
| contract MyPreciousCoin is TokenERC20 { | |
| uint swapRate = 100; // coin/wei | |
| uint limit = 100000; // =1000wei | |
| constructor () TokenERC20(0, "MyPreciousCoin", "MPC") public {} | |
| function saleToken() public payable { | |
| require(msg.value>0); | |
| require(totalSupply<limit); | |
| uint toSale; | |
| uint toReturn; // wei | |
| toSale = msg.value*swapRate; | |
| //※ | |
| if(toSale>(limit-totalSupply)){ | |
| toReturn = (toSale-(limit-totalSupply))/swapRate; | |
| toSale = limit-totalSupply; | |
| } | |
| else{ | |
| toReturn = 0; | |
| } | |
| totalSupply = totalSupply + toSale; | |
| balances[msg.sender] = balances[msg.sender] + toSale; | |
| if(toReturn>0){ | |
| msg.sender.transfer(toReturn); | |
| } | |
| } | |
| } |
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