pragma solidity ^0.4.2;

//  import "./IERC20.sol"; 
//  import "./SafeMath.sol";

pragma solidity ^0.4.2;

/**
* @title SafeMath
* @dev Unsigned math operations with safety checks that revert on error
*/

library SafeMath {
   /**
   * @dev Multiplies two unsigned integers, reverts on overflow.
   */
   function mul(uint256 a, uint256 b) internal pure returns (uint256) {
       // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
       // benefit is lost if 'b' is also tested.
       // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
       if (a == 0) {
           return 0;
       }

       uint256 c = a * b;
       require(c / a == b);

       return c;
   }

   /**
   * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
   */
   function div(uint256 a, uint256 b) internal pure returns (uint256) {
       // Solidity only automatically asserts when dividing by 0
       require(b > 0);
       uint256 c = a / b;
       // assert(a == b * c + a % b); // There is no case in which this doesn't hold

       return c;
   }

   /**
   * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
   */
   function sub(uint256 a, uint256 b) internal pure returns (uint256) {
       require(b <= a);
       uint256 c = a - b;

       return c;
   }

   /**
   * @dev Adds two unsigned integers, reverts on overflow.
   */
   function add(uint256 a, uint256 b) internal pure returns (uint256) {
       uint256 c = a + b;
       require(c >= a);

       return c;
   }

   /**
   * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
   * reverts when dividing by zero.
   */
   function mod(uint256 a, uint256 b) internal pure returns (uint256) {
       require(b != 0);
       return a % b;
   }
}
interface IERC20 {
   function transfer(address to, uint256 value) external returns (bool);

   function approve(address spender, uint256 value) external returns (bool);

   function transferFrom(address from, address to, uint256 value) external returns (bool);

   function totalSupply() external view returns (uint256);

   function balanceOf(address who) external view returns (uint256);

   function allowance(address owner, address spender) external view returns (uint256);

   event Transfer(address indexed from, address indexed to, uint256 value);

   event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract ERC20 is IERC20 {
   using SafeMath for uint256;

   mapping (address => uint256) private _balances;

   mapping (address => mapping (address => uint256)) private _allowed;

   uint256 private _totalSupply;

   /**
   * @dev Total number of tokens in existence
   */
   function totalSupply() public view returns (uint256) {
       return _totalSupply;
   }

   /**
   * @dev Gets the balance of the specified address.
   * @param owner The address to query the balance of.
   * @return An uint256 representing the amount owned by the passed address.
   */
   function balanceOf(address owner) public view returns (uint256) {
       return _balances[owner];
   }

   /**
    * @dev Function to check the amount of tokens that an owner allowed to a spender.
    * @param owner address The address which owns the funds.
    * @param spender address The address which will spend the funds.
    * @return A uint256 specifying the amount of tokens still available for the spender.
    */
   function allowance(address owner, address spender) public view returns (uint256) {
       return _allowed[owner][spender];
   }

   /**
   * @dev Transfer token for a specified address
   * @param to The address to transfer to.
   * @param value The amount to be transferred.
   */
   function transfer(address to, uint256 value) public returns (bool) {
       _transfer(msg.sender, to, value);
       return true;
   }

   /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * Beware that changing an allowance with this method brings the risk that someone may use both the old
    * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
    * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
    * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    * @param spender The address which will spend the funds.
    * @param value The amount of tokens to be spent.
    */
   function approve(address spender, uint256 value) public returns (bool) {
       require(spender != address(0));

       _allowed[msg.sender][spender] = value;
       emit Approval(msg.sender, spender, value);
       return true;
   }

   /**
    * @dev Transfer tokens from one address to another.
    * Note that while this function emits an Approval event, this is not required as per the specification,
    * and other compliant implementations may not emit the event.
    * @param from address The address which you want to send tokens from
    * @param to address The address which you want to transfer to
    * @param value uint256 the amount of tokens to be transferred
    */
   function transferFrom(address from, address to, uint256 value) public returns (bool) {
       _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
       _transfer(from, to, value);
       emit Approval(from, msg.sender, _allowed[from][msg.sender]);
       return true;
   }

   /**
    * @dev Increase the amount of tokens that an owner allowed to a spender.
    * approve should be called when allowed_[_spender] == 0. To increment
    * allowed value is better to use this function to avoid 2 calls (and wait until
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    * Emits an Approval event.
    * @param spender The address which will spend the funds.
    * @param addedValue The amount of tokens to increase the allowance by.
    */
   function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
       require(spender != address(0));

       _allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue);
       emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
       return true;
   }

   /**
    * @dev Decrease the amount of tokens that an owner allowed to a spender.
    * approve should be called when allowed_[_spender] == 0. To decrement
    * allowed value is better to use this function to avoid 2 calls (and wait until
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    * Emits an Approval event.
    * @param spender The address which will spend the funds.
    * @param subtractedValue The amount of tokens to decrease the allowance by.
    */
   function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
       require(spender != address(0));

       _allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue);
       emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
       return true;
   }

   /**
   * @dev Transfer token for a specified addresses
   * @param from The address to transfer from.
   * @param to The address to transfer to.
   * @param value The amount to be transferred.
   */
   function _transfer(address from, address to, uint256 value) internal {
       require(to != address(0));

       _balances[from] = _balances[from].sub(value);
       _balances[to] = _balances[to].add(value);
       emit Transfer(from, to, value);
   }

   /**
    * @dev Internal function that mints an amount of the token and assigns it to
    * an account. This encapsulates the modification of balances such that the
    * proper events are emitted.
    * @param account The account that will receive the created tokens.
    * @param value The amount that will be created.
    */
   function _mint(address account, uint256 value) internal {
       require(account != address(0));

       _totalSupply = _totalSupply.add(value);
       _balances[account] = _balances[account].add(value);
       emit Transfer(address(0), account, value);
   }

   /**
    * @dev Internal function that burns an amount of the token of a given
    * account.
    * @param account The account whose tokens will be burnt.
    * @param value The amount that will be burnt.
    */
   function _burn(address account, uint256 value) internal {
       require(account != address(0));

       _totalSupply = _totalSupply.sub(value);
       _balances[account] = _balances[account].sub(value);
       emit Transfer(account, address(0), value);
   }

   /**
    * @dev Internal function that burns an amount of the token of a given
    * account, deducting from the sender's allowance for said account. Uses the
    * internal burn function.
    * Emits an Approval event (reflecting the reduced allowance).
    * @param account The account whose tokens will be burnt.
    * @param value The amount that will be burnt.
    */
   function _burnFrom(address account, uint256 value) internal {
       _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value);
       _burn(account, value);
       emit Approval(account, msg.sender, _allowed[account][msg.sender]);
   }
}

pragma solidity ^0.4.2;

// import "./IERC20.sol";



/**
* @title ERC20Detailed token
* @dev The decimals are only for visualization purposes.
* All the operations are done using the smallest and indivisible token unit,
* just as on Ethereum all the operations are done in wei.
*/
contract ERC20Detailed is IERC20 {
   string private _name;
   string private _symbol;
   uint8 private _decimals;

   constructor (string memory name, string memory symbol, uint8 decimals) public {
       _name = name;
       _symbol = symbol;
       _decimals = decimals;
   }

   /**
    * @return the name of the token.
    */
   function name() public view returns (string memory) {
       return _name;
   }

   /**
    * @return the symbol of the token.
    */
   function symbol() public view returns (string memory) {
       return _symbol;
   }

   /**
    * @return the number of decimals of the token.
    */
   function decimals() public view returns (uint8) {
       return _decimals;
   }
}
pragma solidity ^0.4.2;

// import "./ERC20.sol";

/**
* @title Burnable Token
* @dev Token that can be irreversibly burned (destroyed).
*/
contract ERC20Burnable is ERC20 {
   /**
    * @dev Burns a specific amount of tokens.
    * @param value The amount of token to be burned.
    */
   function burn(uint256 value) public {
       _burn(msg.sender, value);
   }

   /**
    * @dev Burns a specific amount of tokens from the target address and decrements allowance
    * @param from address The address which you want to send tokens from
    * @param value uint256 The amount of token to be burned
    */
   function burnFrom(address from, uint256 value) public {
       _burnFrom(from, value);
   }
}
pragma solidity ^0.4.2;

/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
pragma solidity ^0.4.2;

// import "./ERC20.sol";
// import "./ERC20Detailed.sol";
// import "./ERC20Burnable.sol";


contract BettingGameZone is ERC20, ERC20Detailed, ERC20Burnable {
   uint8 public constant DECIMALS = 18;
   uint256 public constant INITIAL_SUPPLY = 150000000 * (10 ** uint256(DECIMALS));

   /**
    * @dev Constructor that gives msg.sender all of existing tokens.
    */
   constructor () public ERC20Detailed("BettingGameZone", "BGZ", 18) {
       _mint(msg.sender, INITIAL_SUPPLY);
   }
}