pragma solidity ^0.4.4;

contract Students{

    uint[] data= new uint[](4);

    address _owner = msg.sender;

    function get() constant returns(bool,uint,string,uint){

        return(true,1,'eilinge',3);

    }

    function f() constant returns(uint[]){

        (,data[2],,) = get();

        return data;

    }

    function f1() constant returns(uint,uint){

        require(_owner == msg.sender);

            var (,x,,y) = get();

            (x,y) = (y,x);

            return (x,y);

    }

    //require(_owner == msg.sender);

    //assert(_owner == msg.sender);

    //if (_owner != msg.sender){ revert;}

    //assert()/require():中的条件声明,是if例子中条件块的取反, ==代替了 !=;

}