pragma solidity ^0.4.2;

contract mortal {
    /* Define variable owner of the type address*/
    address owner;

    /* this function is executed at initialization 
       and sets the owner of the contract */
    function mortal() { owner = msg.sender; }

    /* Function to recover the funds on the contract */
    function kill() { if (msg.sender == owner) suicide(owner); }
}

contract greeter is mortal {
    /* define variable greeting of the type string */
    string greeting = "test123";
    event Approval(string _g);

    function setGreeting(string _greeting) public {
        greeting = _greeting;
    }

    /* main function */
    function greet() public constant returns (string) {
        return greeting;
    }

    function fire() public {
        emit Approval(greeting);
    }
}