MyToken.solidity

contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); }

contract owned {
	address public owner;
	
	function owned() {
		owner = msg.sender;
	}
	
	modifier onlyOwner {
		if(msg.sender != owner) throw;
		-
	}
	
	function transferOwnership(address newOwner) onlyOwner {
		owner = newOwner;
	}
}

contract MyToken is owned {
	/* Public variables of the token */
	string public name;
	string public symbol;
	uint8 public decimals;
	uint256 public totalSupply;

	/* This creates an array with all balances */
	mapping (address => uint256) public balanceOf;
	mapping (address => mapping (address => uint256)) public allowance;
	mapping (address => mapping (address => uint256)) public spentAllowance;

	/* This generates a public event on the blockchain that will notify clients */
	event Transfer(address indexed from, address indexed to, uint256 value);

	/* Initializes contract with initial supply tokens to the creator of the contract */
	function MyToken(
		uint256 initialSupply,
		string tokenName,
		uint8 decimalUnits,
		string tokenSymbol,
	) {
		owner = msg.sender;
		balanceOf[msg.sender] = initialSupply;				// Give the creator all initial tokens
		totalSupply = initialSupply;						// Update total supply
		name = tokenName;									// Set the name for display purposes
		symbol = tokenSymbol;								// Set the symbol for display purposes
		decimals = decimalUnits;							// Amount of decimals for display purposes
	}

	/* Send coins */
	function transfer(address _to, uint256 _value) {
		if (balanceOf[msg.sender] < _value) throw;			 // Check if the sender has enough
		if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
		balanceOf[msg.sender] -= _value;					 // Subtract from the sender
		balanceOf[_to] += _value;							 // Add the same to the recipient
		Transfer(msg.sender, _to, _value);					 // Notify anyone listening that this transfer took place
	}

	/* Allow another contract to spend some tokens in your behalf */
	function approveAndCall(address _spender, uint256 _value, bytes _extraData)
		returns (bool success) {
		allowance[msg.sender][_spender] = _value;
		tokenRecipient spender = tokenRecipient(_spender);
		spender.receiveApproval(msg.sender, _value, this, _extraData);
		return true;
	}

	/* A contract attempts to get the coins */
	function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
		if (balanceOf[_from] < _value) throw;				  // Check if the sender has enough
		if (balanceOf[_to] + _value < balanceOf[_to]) throw;  // Check for overflows
		if (spentAllowance[_from][msg.sender] + _value > allowance[_from][msg.sender]) throw;	// Check allowance
		balanceOf[_from] -= _value;							 // Subtract from the sender
		balanceOf[_to] += _value;							 // Add the same to the recipient
		spentAllowance[_from][msg.sender] += _value;
		Transfer(_from, _to, _value);
		return true;
	}

	/* This unnamed function is called whenever someone tries to send ether to it */
	function () {
		throw;	   // Prevents accidental sending of ether
	}
}