• <ins id="pjuwb"></ins>
    <blockquote id="pjuwb"><pre id="pjuwb"></pre></blockquote>
    <noscript id="pjuwb"></noscript>
          <sup id="pjuwb"><pre id="pjuwb"></pre></sup>
            <dd id="pjuwb"></dd>
            <abbr id="pjuwb"></abbr>

            李帥的博客

            軟件開發(fā)愛好者

              C++博客 :: 首頁(yè) :: 新隨筆 :: 聯(lián)系 :: 聚合  :: 管理 ::
              14 隨筆 :: 3 文章 :: 4 評(píng)論 :: 0 Trackbacks
            9. Which of the following statements provide a valid reason NOT to use RTTI for distributed (i.e. networked between different platforms) applications in C++?
            A. RTTI is too slow.
            B. RTTI does not have standardized run-time behavior.
            C. RTTI uses too much memory.
            D. RTTI's performance is unpredictable/non-deterministic.
            E. RTTI frequently fails to function correctly at run-time

            11. A C++ developer wants to handle a static_cast <char*>() operation for the class String shown below. Which of the following options are valid declarations that will accomplish this task?
            class String {
            public:
              //...
              //declaration goes here
            };
            A. char* operator char*();
            B. operator char*();
            C. char* operator();
            D. String operator char*();
            E. char* operator String();


            16. When a Copy Constructor is not written for a class, the C++ compiler generates one. Which of the following statements correctly describe the actions of this compiler-generated Copy Constructor when invoked?
            A. The compiler-generated Copy Constructor makes the object being constructed, a reference to the object passed to it as an argument.
            B. The compiler-generated Copy Constructor does not do anything by default.
            C. The compiler-generated Copy Constructor performs a member-wise copy of the object passed to it as an argument, into the object being constructed.
            D. The compiler-generated Copy Constructor tags the object as having been Copy-Constructed by the compiler.
            E. The compiler-generated Copy Constructor invokes the assignment operator of the class.

            17. Which of the following must be ensured in order to implement a polymorphic function in C++?
            A.        There has to be a pointer of the derived class that has implemented the polymorphic function that holds the address of the derived class object.
            B.        The function must be declared as virtual in both the base class and in the derived class that overrides the function.
            C.        The function must be declared as pure virtual.
            D.        There has to be a base class pointer holding the address of a base or derived class object that has implemented the polymorphic function.
            E.        The function must be declared as virtual in the base class.

            18. Protected, or private, inheritance, as opposed to public inheritance, models which type of relationship in C++?
            A.        Can-only-have-one-of
            B.        Is-implemented-in-terms-of
            C.        Was-a
            D.        Has-a
            E.        Shares-a-relationship-with

            19. Which of the following statements describe correct methods of handling C++ exceptions?
            A.        Once an exception is thrown, the compiler unwinds the heap, freeing any memory dynamically allocated within the block from which the exception was thrown.
            B.        In a hierarchy of exception classes, the order of handling exceptions can be from the most specific class to the most general class.
            C.        Catching an exception by reference is preferable to catching it by value.
            D.        If an exception is caught by its address or pointer, it is the responsibility of the thrower to release the memory occupied by the exception.
            E.        To write an exception handler, it is essential to know the concrete class of exception to catch.

            20. Which of the following statements regarding functions' default arguments in C++ are correct?
            A.        Default arguments cannot be of a user-defined type.
            B.        Default arguments exist in the global heap and not on the function's stack.
            C.        Default arguments cannot be of pointer type.
            D.        Default arguments can never precede non-default arguments.
            E.        Default arguments are not considered for generating the function's signature.

            21. Which of the following classes must be instantiated so that the object can be used both for reading and writing to the same file in C++?
            A.        ofstream
            B.        stream
            C.        ifstream
            D.        fstream
            E.        iostream

            22.  Which of the following reasons describe why a destructor cannot throw an exception in C++?
            A.        Since the object is being destroyed, it is illogical to throw an exception then.
            B.        A destructor may be invoked as a result of stack unwinding while an exception is being handled.
            C.        It can invoke the terminate() handler.
            D.        The C++ language does not permit it; a throw statement in a destructor will be caught as an error by the compiler.
            E.        A destructor in C++ cannot implement a try...catch block

            24. Which of the following identify const-correctness failures in the C++ program below?
            template<typename T>
            class MyArray
            {
            public:
                MyArray();
                MyArray(MyArray& copy);
                MyArray& operator=(MyArray& copy);
                //...

            };

            class MyData
            {
            public:
                MyData(MyArray<int>& x, MyArray<int>& y);
                //...

                const MyArray<int>& x();
                const MyArray<int>& y();
            };

            MyArray<int> read_data(int*, char**);
            void make_changes(MyData* edit);

            int main(int argc, char* argv[])
            {
                const MyArray<int> read_x = read_data(&argc, argv);
                const MyArray<int> read_y = read_data(&argc, argv);
                 
                MyData user_data(read_x, read_y);
                MyData edit_buffer(user_data);
                make_changes(&edit_buffer);
            }

            A.        MyData(MyArray<int>& x, MyArray<int>& y); should be
            MyData(const MyArray<int>& x, const MyArray<int>& y);

            B.        MyArray(MyArray& copy); should be
            MyArray(const MyArray& copy);

            C.        MyArray& operator=(MyArray& copy); should be
            const MyArray& operator=(const MyArray& copy);

            D.        void make_changes(MyData* edit); should be
            void make_changes(const MyData* edit);

            E.        const MyArray& operator=(const MyArray& copy); should be
            const MyArray& operator=(const MyArray& copy) const;

            25. Which of the following operators must be overloaded by function objects in the Standard Template Library?
            A.        operator +()
            B.        operator ==()
            C.        operator ++()
            D.        operator ()()
            E.        operator []()

            ======================================================

            附上我的選擇和疑問,歡迎大家指正和討論:

            9. AD (not quite sure)
            11. A (What does this question mean?! Can anyone explain it? )
            16. AC  (Is A right?! Should it be 'a CONST reference to the object passed to it as an argument')
            17. E (not quite sure. Is A or D right too? )
            18. A or E. I have no idea at all!!!!
            19 C (Is B right too?)
            20. only D?
            21. DE
            22. BC ?
            24. only B ?
            25. D
            posted on 2008-11-07 21:37 李帥 閱讀(1360) 評(píng)論(1)  編輯 收藏 引用

            評(píng)論

            # re: 幾道C++筆試題,不定項(xiàng)選擇,請(qǐng)高手解答分析,歡迎討論。 2011-09-21 17:55 臭美街
            [url=http://www.choumeijie.com/]臭美街[/url]  回復(fù)  更多評(píng)論
              


            只有注冊(cè)用戶登錄后才能發(fā)表評(píng)論。
            網(wǎng)站導(dǎo)航: 博客園   IT新聞   BlogJava   博問   Chat2DB   管理


            亚洲精品无码专区久久同性男| 日韩AV无码久久一区二区| 久久久久夜夜夜精品国产| 久久久青草久久久青草| 亚洲国产成人久久综合一区77| 久久久国产视频| 国产精品美女久久久m| 国产高清美女一级a毛片久久w | 国产成人精品久久一区二区三区| 香港aa三级久久三级| 无码人妻久久一区二区三区蜜桃| 99久久婷婷免费国产综合精品| 久久久久亚洲AV成人网人人软件| 久久发布国产伦子伦精品| 久久综合色区| 亚洲午夜精品久久久久久人妖| 亚洲人成网亚洲欧洲无码久久| 91精品国产91久久| 久久精品aⅴ无码中文字字幕重口| 久久精品99无色码中文字幕| 国产成人久久精品区一区二区| 国产一区二区久久久| 久久久久99精品成人片| 91视频国产91久久久| 亚洲国产精品一区二区久久hs| 一本大道久久东京热无码AV| 国产精品伦理久久久久久| 国产成人精品久久二区二区| 欧美噜噜久久久XXX| 7777久久久国产精品消防器材 | 欧美丰满熟妇BBB久久久| 一极黄色视频久久网站| 久久综合狠狠综合久久97色| 久久无码一区二区三区少妇| 久久亚洲AV永久无码精品| 久久精品亚洲精品国产欧美| 精品久久综合1区2区3区激情| 久久99中文字幕久久| 久久99精品国产一区二区三区| 99re久久精品国产首页2020| 久久九九有精品国产23百花影院|