pragma solidity >=0.4.22 <0.6.0;

library hitung {
    function add(uint a, uint b) internal pure returns (uint c) {
         c = a + b;
         require(c >= a);
    }
    function sub(uint a, uint b) internal pure returns (uint c) {
        require(b <= a);
        c = a - b;
    }
    function mul(uint a, uint b) internal pure returns (uint c) {
        c = a * b;
        require( a == 0 || c / a == b);
    }
    function div(uint a, uint b) internal pure returns (uint c) {
         require(b > 0);
         c = a / b;
    }
}
 contract Owned {
     address public owner;
     address public newOwner;
     
     event OwnershipTransferred(address indexed _from, address indexed _to);
     
     constructor() public {
         owner = msg.sender;
     }
     
     modifier onlyOwner {
         require(msg.sender == owner);
         _;
     }
     
     function transferOwnership(address _newOwner) public onlyOwner {
         newOwner = _newOwner;
     }
     function acceptOwnership() public {
     require(msg.sender == newOwner);
     emit OwnershipTransferred(owner, newOwner);
     newOwner = address(0);
     }
 }
 
 contract Youfuture {
     function totalSupply() public view returns (uint);
     function balanceOf(address tokenOwner) public view returns (uint balance);
     function allowance(address tokenOwner, address spender) public view 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 DetailToken is Youfuture, Owned {
     using hitung for uint;
     string public symbol;
     string public name;
     uint8 public decimals;
     uint _totalSupply;
     
     mapping(address => uint) balances;
     mapping(address => mapping(address => uint)) allowed;
     
     
         constructor() public {
         symbol = "YFTT";
         name = "YouFuture";
         decimals = 18;
         _totalSupply = 30000 * 10**uint(decimals);
         balances[0x3927b71C8c59e765288A14E9098a8A26A2341256] = _totalSupply;
         emit Transfer(address(0), 0x3927b71C8c59e765288A14E9098a8A26A2341256, _totalSupply);
}

        function totalSupply() public view returns (uint) {
            return _totalSupply.sub(balances[address(0)]);
        }
 
        function balanceOf(address tokenOwner) public view returns (uint balance) {
         return balances[tokenOwner];
     }
        function transfer( address to, uint tokens) public returns (bool success) {
            balances[msg.sender] = balances[msg.sender].sub(tokens);
            balances[to] = balances[to].add(tokens);
            emit Transfer(msg.sender, to, tokens);
            return true;
        }
        
        function approve(address spender, uint tokens) public returns (bool success) {
            allowed[msg.sender][spender] = tokens;
            emit Approval(msg.sender, spender, tokens);
            return true;
        }
        
        function transferFrom(address from, address to, uint tokens) public returns (bool success) {
        balances[from] = balances[from].sub(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        emit Transfer(from, to, tokens);
        return true;
        }
        
        function allowance(address tokenOwner, address spender) public view returns (uint remaining) {
            return allowed[tokenOwner][spender];
        }
 }

{
  "compilationTarget": {
    "DetailToken.sol": "DetailToken"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}