contracts

BAD

contract token { 
    mapping (address => uint) balances;
	
	// Initializes contract with 10 000 tokens to the creator of the contract
	function token() {
        balances[msg.sender] = 10000;
    }
	// Very simple trade function
    function sendToken(address receiver, uint amount) returns(bool sufficient) {
        if (balances[msg.sender] < amount) return false;
        balances[msg.sender] -= amount;
        balances[receiver] += amount;
        return true;
    }
	
	// Check balances of any account
	function getBalance(address account) returns(uint balance){
		return balances[account];
	}
	
}

OK

contract greeter {
	function greet(bytes32 input) returns (bytes32) {
		if (input == "") {	return "Hello, World"; }
		return input; 
	}
}