Solidity Function Calls Example 2

pragma solidity ^0.4.0;

contract DataFeed {
    function data() payable returns (uint dataReturn) { return 42; }
}

contract DataConsumer {
    InfoFeed feed;
    function feedSet(address addr) { feed = DataFeed(addr); }
    function feedCall() { feed.data.value(10).gas(800)(); }
}