C++测试题练习题1

1、which of the following is not automatically generated by the compiler?

      a. default constructor    b. copy constructor    c. equality operator(op==)     d. assignment operator(op=)       e. destructor

2、which of the following is not an STL collection?

      a. vector   b. list     c. map    d. tree      e. set

3、which statement is false?

      a. Destructors are called when a pointer is deleted.     

      b. Destructors are called when an object goes out of scope.

      c. Destructors are called when a reference goes out of scope.

      d. A virtual destructor should be used if the class has virtual methods.

      e. Base class destructors are called after derived class destructors.

4、what should you avoid calling from a constructor?

       a. a static method    b. an inlined method       c. a virual method      d. a const method          e. an extern method

5、which of the following C++ operators cannot be overloaded?

       a. <<           b. []             c. ++             d. ()               e. :?

6、Consider the following function:

void foo(const char* name) 
{ 
     char* Name1 = name;            //Statement1 
     const char* Name2 = name;   //Statement2 
     char* const Name3 = name;   //Statement3 
     char const* Name4 = name;   //Statement4 
} 

 which of the following is true?

    a. Statement 1 fails to compile                   b. Statement 1 and 3 fails to compile

    c. Statement 3 and 4 fails to compile          d. Statment 2 fails to compile

    e. Statment 3 and 4 fails to compile

7、Consider the following code:

struct MyStruct
{ 
     int foo(){return 1;}
};
 class MyClass
{ 
      int foo(){ return 2;}
}; 
MyStruct s; 
MyClass c; 
***** 
int x = s.foo();   //Statement1 
int y = c.foo();    //Statement2

Circle one answer below which is true of the above code.

       a. Statement 1 will cause a compilation error                     b. Statement 2 will cause a compilation error

       c. Both statement will compilation successfully                   d. Both statement will fail to compile

8、Consider the following class:

class ClassX 
{ 
    public: ClassX():C_(1),B_(2),A_(B_+C_){} 

     private: 
          int A_; 
          int B_;
          int C_; 
};

 what value will the member variable A be initialized to?

       a. 0          b. 1             c. 2                d. 3                 e. None of the above

9、Name the design pattern that is implemented in the following C++ class:

class XXX 
{ 
     public: 
    static XXX * instance() 
         { 
          static XXX x; return &x; 
         } 
      protected: 
      { 
       XXX(){} 
       }
 }; 

a. proxy b. composite c. singleton d. factory e.adapter

10 
class Foo
{
public:
    virtual void cala()
    {
      cout << "foo"<<end1;
    }
}

class Bar : public Foo
{
public:
    void calc()
    {
     cout << "bar"<<end1;
    }
}

int main()
{
   Bar * b1 = new Bar();
   Bar b2;
   Foo f1 = *b1;
   Foo &f2 = b2;
   Foo *f3 = b1;

   f1.calc();
   f2.calc();
   f3.calc(); 
}

which of the output of the above code?

           a. foo foo foo     b. foo bar   bar       c. foo   foo    bar       d. bar    bar   bar     e.   bar  foo bar