• <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 :: 新隨筆 :: 聯(lián)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(1360) 評論(1)  編輯 收藏 引用

            評論

            # re: 幾道C++筆試題,不定項(xiàng)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(fù)  更多評論
              

            久久亚洲精品国产亚洲老地址| 一本久久a久久精品vr综合| 久久精品久久久久观看99水蜜桃| 99热都是精品久久久久久| 久久综合综合久久97色| 久久91综合国产91久久精品| 久久av无码专区亚洲av桃花岛| 久久久久免费精品国产| 日本强好片久久久久久AAA| 无码人妻久久一区二区三区免费| 色偷偷88888欧美精品久久久| 亚洲综合精品香蕉久久网| 乱亲女H秽乱长久久久| 久久精品中文无码资源站| 久久精品aⅴ无码中文字字幕重口 久久精品a亚洲国产v高清不卡 | 精品久久人妻av中文字幕| 久久综合综合久久综合| 久久精品国产99国产精偷| 久久久国产精品福利免费| 国产成人99久久亚洲综合精品| 久久青青草原精品国产不卡| 日韩AV毛片精品久久久| 99久久国产宗和精品1上映| 97热久久免费频精品99| 狠狠色综合网站久久久久久久| 亚洲AⅤ优女AV综合久久久| 久久久无码人妻精品无码| 久久996热精品xxxx| 久久精品国产亚洲AV不卡| 久久99精品久久久久久| 伊人久久大香线蕉AV一区二区| 人妻久久久一区二区三区| 国产精品九九久久精品女同亚洲欧美日韩综合区 | 久久综合欧美成人| 中文精品久久久久人妻| 久久99精品国产麻豆宅宅| 久久免费看黄a级毛片| 999久久久免费国产精品播放| 国产成人精品久久| 国产三级观看久久| …久久精品99久久香蕉国产 |