• <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

            軟件開發愛好者

              C++博客 :: 首頁 :: 新隨筆 :: 聯系 :: 聚合  :: 管理 ::
              14 隨筆 :: 3 文章 :: 4 評論 :: 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(1362) 評論(1)  編輯 收藏 引用

            評論

            # re: 幾道C++筆試題,不定項選擇,請高手解答分析,歡迎討論。 2011-09-21 17:55 臭美街
            [url=http://www.choumeijie.com/]臭美街[/url]  回復  更多評論
              

            久久精品国产一区二区三区不卡| 九九久久精品无码专区| 久久久久久毛片免费播放| 91久久婷婷国产综合精品青草| 久久综合久久综合久久| 久久久久久精品免费免费自慰| 国内精品久久久久影院一蜜桃| 无码8090精品久久一区| 国产精品岛国久久久久| 久久久久久久波多野结衣高潮 | 国产福利电影一区二区三区,免费久久久久久久精 | 亚州日韩精品专区久久久| 久久久噜噜噜www成人网| 久久精品国产一区二区三区不卡 | 四虎久久影院| 久久久综合九色合综国产| 99久久夜色精品国产网站| 久久国产影院| 91精品国产高清久久久久久国产嫩草 | 亚洲精品无码久久久| 7国产欧美日韩综合天堂中文久久久久 | 国产69精品久久久久9999| 人妻少妇久久中文字幕一区二区 | 久久久久av无码免费网| 亚洲国产小视频精品久久久三级| 色综合久久88色综合天天| 久久久久亚洲av无码专区导航| 久久久精品久久久久影院| 伊人色综合久久天天网| 久久综合成人网| 色婷婷噜噜久久国产精品12p| 精品人妻伦九区久久AAA片69| 93精91精品国产综合久久香蕉| 久久亚洲精品中文字幕三区| 国产69精品久久久久777| 99麻豆久久久国产精品免费| 91精品国产综合久久精品| 色综合色天天久久婷婷基地| 亚洲天堂久久精品| 国产激情久久久久影院老熟女免费 | 亚洲伊人久久大香线蕉综合图片|