pragma solidity ^0.4.2;

contract XCoin {

	string public name = 'X-Coin';
	string public symbol = 'XC';
	string public standard = 'X-Coin Token v1.0';
	uint256 public decimals = 5;
	uint256 public totalSupply;

	event Transfer(
		address indexed _from,
		address indexed _to,
		uint256 _value
	);

	event Approval(
		address indexed _owner,
		address indexed _spender,
		uint256 _value
	);

	mapping(address => uint256) public balanceOf;
	mapping(address => mapping(address => uint256)) public allowance;

	constructor(uint256 _initialSupply) public {
		balanceOf[msg.sender] = _initialSupply;
		totalSupply = _initialSupply;		
	}

	function transfer(address _to, uint256 _value) public returns(bool success) {
		require(balanceOf[msg.sender] >= _value);
		balanceOf[msg.sender] -= _value;
		balanceOf[_to] += _value;

		Transfer(msg.sender, _to, _value);
		return true;
	}

	function approve(address _spender, uint256 _value) public returns(bool success){
		allowance[msg.sender][_spender] = _value;
		Approval(msg.sender, _spender, _value);
		return true;	
	}

	function transferFrom(address _from, address _to, uint256 _value) public returns(bool success){
		require(_value <= balanceOf[_from]);
		require(_value <= allowance[_from][msg.sender]);
		
		balanceOf[_from] -= _value;
		balanceOf[_to] += _value;
		
		allowance[_from][msg.sender] -= _value;

		Transfer(_from, _to, _value);
		return true;
	}
}