// File: IERC20.sol



pragma solidity ^0.4.11;

interface IERC20 {
    function totalSupply() view returns (uint256 totalSupply);
    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);
    
}
// File: qwlaToken.sol



pragma solidity ^0.4.11;

import './IERC20.sol';
import './SafeMath.sol';

contract qwlaToken is IERC20 {

	using SafeMath for uint256;

	uint public constant  _totalSupply = 100000000 * 10**uint(decimals);

	string public constant symbol = "QWLA";
	string public constant name = "Qawalla Token";
	uint8 public constant decimals = 18; 


	mapping(address => uint256) balances;
	mapping(address => mapping(address => uint256)) allowed;
	
	function qwlaToken(){
			balances[msg.sender] = _totalSupply;
	}

	function totalSupply() constant returns (uint256 totalSupply) {
		return _totalSupply;
	}

	function balanceOf(address _owner) constant returns (uint256 balance) {
			return balances[_owner];
			
	}

	function transfer(address _to, uint256 _value) returns (bool success) {
			require(
				balances[msg.sender] >= _value
				&& _value > 0
				);
				balances[msg.sender] = balances[msg.sender].sub( _value);
				balances[_to] = balances[_to].add(_value);
				Transfer(msg.sender, _to, _value);
				return true;
	}

	function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
			require(
				allowed[_from][msg.sender] >= _value
				&& balances[_from] >= _value
				&& _value > 0

			);
			balances[_from] = balances[_from].sub(_value);
			balances[_to] = balances[_to].add(_value);
			allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
			Transfer(_from, _to, _value);
			return true;
			
	}

	function approve(address _spender, uint256 _value) returns (bool success) {
			allowed[msg.sender][_spender] = _value;
			Approval(msg.sender, _spender, _value);
			return true;
	}

	function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
			return allowed[_owner][_spender];
	}

	event Transfer(address indexed _from, address indexed _to, uint256 _value);
	event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}


// File: SafeMath.sol



pragma solidity ^0.4.23;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting '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;
    }

    c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  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 a / b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}