pragma solidity ^0.4.17;

/* 7Star Exchange Kangaroo Token */
/* www.1234567.io */

contract Token {
    uint256 public totalSupply;
    uint256 public constant decimals = 18;
    function balanceOf(address _owner) public view returns (uint256 balance);
    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);
}

/*  ERC 20 token */
contract StandardToken is Token {
    function formatDecimals(uint256 _value) internal pure returns (uint256 ) {
        return _value * 10 ** decimals;
    }
    
    function transfer(address _to, uint256 _value) public returns (bool success) {
        _value = formatDecimals(_value);
        if (balances[msg.sender] >= _value && _value > 0) {
            balances[msg.sender] -= _value;
            balances[_to] += _value;
            emit Transfer(msg.sender, _to, _value);
            return true;
        } else {
            return false;
        }
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        _value = formatDecimals(_value);
        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
            balances[_to] += _value;
            balances[_from] -= _value;
            allowed[_from][msg.sender] -= _value;
            emit Transfer(_from, _to, _value);
            return true;
        } else {
            return false;
        }
    }

    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) public returns (bool success) {
        _value = formatDecimals(_value);
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
}

contract KTCoin is StandardToken {
    string  public constant name = "7Star Exchange Kangaroo Token";
    string  public constant symbol = "KT";
    string  public version = "1.0";

    constructor() public {
		totalSupply = formatDecimals(3000000000);
        balances[msg.sender] =totalSupply;
    }
}