C++ Institute CPA-21-02 Online Practice Questions and Exam Preparation

C++ Institute CPA-21-02 Online Questions & Answers

• Question 111:

  What happens when you attempt to compile and run the following code?

  #include

  using namespace std;

  class First

  {

  public:

  virtual void Print(){ cout<<"from First";}

  };

  class Second:public First

  {

  public:

  void Print(){ cout<< "from Second";}

  };

  void fun(First *obj);

  int main()

  {

  First FirstObject;

  fun(andFirstObject);

  Second SecondObject;

  fun(andSecondObject);

  }

  void fun(First *obj)

  {

  obj?>Print();

  }

  A. It prints: from First
  B. It prints: from Firstfrom First
  C. It prints: from Firstfrom Second
  D. It prints: from Secondfrom Second
  C. It prints: from Firstfrom Second

• Question 112:

  Which definitions are correct?

  A. int age;
  B. int double;
  C. char c;
  D. int char;
  A. int age;
  C. char c;

• Question 113:

  What happens when you attempt to compile and run the following code?

  #include

  using namespace std;

  class First

  {

  public:

  First() { cout << "Constructor";}

  ~First() { cout << "Destructor";}

  void Print(){ cout<<"from First";}

  };

  int main()

  {

  First FirstObject;

  FirstObject.Print();

  }

  A. It prints: Constructorfrom First
  B. It prints: Constructorfrom FirstDestructor
  C. It prints: Constructorfrom FirstDestructorDestructor
  D. Compilation error at line 16
  B. It prints: Constructorfrom FirstDestructor

• Question 114:

  What happens when you attempt to compile and run the following code?

  #include

  using namespace std;

  class A

  {

  public:

  virtual void Print()=0;

  };

  class B:public A

  {

  public:

  virtual void Print(){ cout<< "B";}

  };

  int main()

  {

  B ob2;

  A *obj;

  obj = andob2;

  obj?>Print();

  }

  A. It prints: B
  B. It prints: A
  C. It prints: AB
  D. It prints: BA
  A. It prints: B

• Question 115:

  What is the output of the program if character "1" is supplied as input?

  #include

  using namespace std;

  int main () {

  int c;

  cin >> c;

  try

  {

  switch (c)

  {

  case 1:

  throw 20;

  case 2:

  throw 5.2f;

  case 3:

  throw 'a';

  }

  }

  catch (int e)

  { cout << "int exception. Exception Nr. " << e; }

  catch (float e)

  { cout << "float exception. Exception Nr. " << e; }

  catch (...)

  { cout << "An exception occurred."; }

  return 0; }

  A. It prints: float exception. Exception Nr. 5.2
  B. It prints: int exception. Exception Nr. 20
  C. It prints: An exception occurred
  D. Compilation Error
  B. It prints: int exception. Exception Nr. 20

• Question 116:

  What is the output of the program?

  #include

  #include

  using namespace std;

  union t

  {

  char c;

  int i;

  };

  class First

  {

  union t u;

  public:

  First() {

  u.c

  = 'A';

  }

  void Print(){

  cout << u.c;

  }

  };

  int main()

  {

  First *t = new First();

  t?>Print();

  }

  A. Garbage value
  B. It prints: A
  C. It prints: A 65
  D. Compilation error
  B. It prints: A

  ---

  Explanation/Reference:

• Question 117:

  What happens when you attempt to compile and run the following code?

  #include

  #include

  using namespace std;

  class A {

  int x;

  protected:

  int y;

  public:

  int z;

  };

  class B : private A {

  string name;

  public:

  void set() {

  x = 1;

  }

  void Print() {

  cout << x;

  }

  };

  int main () {

  B b;

  b.set();

  b.Print();

  return 0;

  }

  A. It prints: 123
  B. It prints: 1
  C. It prints: ?123
  D. Compilation error
  D. Compilation error

  ---

  Explanation/Reference:

• Question 118:

  Which code line inserted instead of the comment below will fix the program so that it produces the expected output and does not cause any memory leak?

  

  A. delete [] p;
  B. delete p[];
  C. delete p;
  D. delete *p;
  A. delete [] p;

• Question 119:

  Which code, inserted at line 14, generates the output "3.14 10"?

  #include

  using namespace std;

  namespace myNamespace1

  int x = 5;

  int y = 10;

  } namespace myNamespace2 { float x = 3.14; float y = 1.5; } int main () { //insert code here cout << x << " " << y; return 0; }

  A. using myNamespace2::y; using myNamespace1::x;
  B. using namespace myNamespace1;
  C. using namespace myNamespace1; using namespace myNamespace2;
  D. using myNamespace1::y; using myNamespace2::x;
  D. using myNamespace1::y; using myNamespace2::x;

• Question 120:

  How many times will "HELLO" be printed?

  #include

  using namespace std;

  int main()

  {

  for(int i=?1; i<=10; i++)

  {

  if(i < 5)

  continue;

  else

  break;

  cout<<"HELLO";

  }

  return 0;

  }

  A. 1
  B. 2
  D. 20
  C