pragma solidity ^0.4.0;

contract base{

    address public _owner=msg.sender;

    uint _a;

    string internal _b ;

    uint private _c;

    //uint external _d;ParserError: Expected identifier but got 'external'

    function base() {

        _a =10;

        //uint  _d public;Expected ';' but got 'public'

        string _f;

    }

    function getA() public view returns (uint){

        return _a;

    }

    function setA(uint c) internal{

        _a=c;

    }

    //modifier OnlyAdmin() private{Expected '{' but got 'private'

    modifier OnlyAdmin(){

        require(_owner == msg.sender);

        _;

    }

    function kill() OnlyAdmin() external{

        setA(6);

        this.getA();

        selfdestruct(msg.sender);

    }

}

contract base1 is base{

    function getA() public view returns(uint){

        //return _c;DeclarationError: Undeclared identifier. Did you mean "_a" or "_b"?

        //return _b;Overriding function return types differ:覆盖函数返回类型不同

        return _a;

    }

    function getE(){

        this.kill();

        this.getA();

        //this.setA(20);Member "setA" not found or not visible after argument-dependent lookup in contract base1

    }

}

contract base2{

    uint public _e;

    function getE(){

        //this.getA();Member "getA" not found or not visible after argument-dependent lookup in contract base2

    }

}

//contract base2 is base1,base{ Linearization of inheritance graph impossible:继承图的线性化是不可能的

contract base3 is base,base1{

    uint public _e;

}