pragma solidity ^0.4.24;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a && c >= b);
    return c;
  }

  function max64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
  }


}





contract owned { //Contract used to only allow the owner to call some functions
  address public owner;

  function owned() public {
  owner = msg.sender;
  }

  modifier onlyOwner {
  require(msg.sender == owner);
  _;
  }

  function transferOwnership(address newOwner) onlyOwner public {
  owner = newOwner;
  }
}


contract TokenERC20 {

using SafeMath for uint256;
// Public variables of the token
string public name;
string public symbol;
uint8 public decimals = 18;
//
uint256 public totalSupply;


// This creates an array with all balances
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;

// This generates a public event on the blockchain that will notify clients
event Transfer(address indexed from, address indexed to, uint256 value);

// This notifies clients about the amount burnt
event Burn(address indexed from, uint256 value);

/**
* Constrctor function
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
function TokenERC20(uint256 initialSupply, string tokenName, string tokenSymbol) public {
  totalSupply = initialSupply * 10 ** uint256(decimals);  // Update total supply with the decimal amount
  balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
  name = tokenName;                                   // Set the name for display purposes
  symbol = tokenSymbol;                               // Set the symbol for display purposes
}

/**
* Internal transfer, only can be called by this contract
*/
function _transfer(address _from, address _to, uint _value) internal {
  // Prevent transfer to 0x0 address. Use burn() instead
  require(_to != 0x0);
  // Check for overflows
  // Subtract from the sender
  balanceOf[_from] = balanceOf[_from].sub(_value);
  // Add the same to the recipient
  balanceOf[_to] = balanceOf[_to].add(_value);
  emit Transfer(_from, _to, _value);
}

/**
* Function to Transfer tokens
*
* Send `_value` tokens to `_to` from your account
*
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transfer(address _to, uint256 _value) public {
  _transfer(msg.sender, _to, _value);
}

/**
* function to Transfer tokens from other address
*
* Send `_value` tokens to `_to` in behalf of `_from`
*
* @param _from The address of the sender
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
  allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);
  _transfer(_from, _to, _value);
  return true;
}

/**
* function Set allowance for other address
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
*/
function approve(address _spender, uint256 _value) public returns (bool success) {
  allowance[msg.sender][_spender] = _value;
  return true;
}


/**
*Function to Destroy tokens
*
* Remove `_value` tokens from the system irreversibly
*
* @param _value the amount of money to burn
*/
function burn(uint256 _value) public returns (bool success) {
  balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);            // Subtract from the sender
  totalSupply = totalSupply.sub(_value);                      // Updates totalSupply
  emit Burn(msg.sender, _value);
  return true;
}



/**
* Destroy tokens from other ccount
*
* Remove `_value` tokens from the system irreversibly on behalf of `_from`.
*
* @param _from the address of the sender
* @param _value the amount of money to burn
*/
function burnFrom(address _from, uint256 _value) public returns (bool success) {
  balanceOf[_from] = balanceOf[_from].sub(_value);                         // Subtract from the targeted balance
  allowance[_from][msg.sender] =allowance[_from][msg.sender].sub(_value);             // Subtract from the sender's allowance
  totalSupply = totalSupply.sub(_value);                              // Update totalSupply
  emit Burn(_from, _value);
  return true;
}


}

/******************************************/
/*       Accommodation Coin STARTS HERE       */
/******************************************/

contract AccommodationCoin is owned, TokenERC20  {

  //Modify these variables
  uint256 _initialSupply=100000000; 
  string _tokenName="Accommodation Coin";  
  string _tokenSymbol="ACC";

  mapping (address => bool) public frozenAccount;

  /* This generates a public event on the blockchain that will notify clients */
  event FrozenFunds(address target, bool frozen);

  /* Initializes contract with initial supply tokens to the creator of the contract */
  function AccommodationCoin( ) TokenERC20(_initialSupply, _tokenName, _tokenSymbol) public {}

  /* Internal transfer, only can be called by this contract. */
  function _transfer(address _from, address _to, uint _value) internal {
    require (_to != 0x0);                               // Prevent transfer to 0x0 address. Use burn() instead
    require(!frozenAccount[_from]);                     // Check if sender is frozen
    require(!frozenAccount[_to]);                       // Check if recipient is frozen
    balanceOf[_from] = balanceOf[_from].sub(_value);                         // Subtract from the sender
    balanceOf[_to] = balanceOf[_to].add(_value);                           // Add the same to the recipient
    emit Transfer(_from, _to, _value);
  }

  /// function to create more coins and send it to `target`
  /// @param target Address to receive the tokens
  /// @param mintedAmount the amount of tokens it will receive
  function mintToken(address target, uint256 mintedAmount) onlyOwner public {
    balanceOf[target] = balanceOf[target].add(mintedAmount);
    totalSupply = totalSupply.add(mintedAmount);
    emit Transfer(0, this, mintedAmount);
    emit Transfer(this, target, mintedAmount);
  }

  function freezeAccount(address target, bool freeze) onlyOwner public {
    frozenAccount[target] = freeze;
    emit FrozenFunds(target, freeze);
  }



}