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

• Question 161:

  What will the variable "y" be in class B?

  class A {

  int x;

  protected:

  int y;

  public:

  int age;

  };

  class B : protected A {

  string name;

  public:

  void Print() {

  cout << name << age;

  }

  };

  A. public

  B. private

  C. protected

  D. None of these

  Correct Answer: C

• Question 162:

  How many copies of the value member are stored in memory during program execution?

  

  A. as many as objects of the A class plus one

  B. as many as obiects of the A class and its inheritants

  C. as many as objects of the A class

  D. one

  Correct Answer: D

• Question 163:

  Which code lines inserted independently instead of the comment will make the following program work correctly? (Choose three.)

  

  A. int main (int argc, char *argv[])

  B. int main (int c, char *v[])

  C. int main

  D. void main ()

  Correct Answer: AB

• Question 164:

  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

  Correct Answer: B

• Question 165:

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

  #include

  using namespace std; int main()

  {

  int i = 5;

  cout<<"Hello World" << ++i;

  return 0;

  }

  A. It prints: Hello World6

  B. It prints: Hello

  C. It prints: World

  D. It prints: Hello World5

  Correct Answer: A

• Question 166:

  Which code, inserted at line 19, generates the output "23"?

  #include

  #include

  using namespace std;

  class A {

  int x;

  protected:

  int y;

  public:

  int z;

  A() { x=1; y=2; z=3; }

  };

  class B : public A {

  string z;

  public:

  int y;

  void set() { y = 4; z = "John"; }

  void Print() {

  //insert code here

  }

  };

  int main () {

  B b;

  b.set();

  b.Print();

  return 0;

  }

  A. cout << y << z;

  B. cout << y << A::z;

  C. cout << A::y << A::z;

  D. cout << B::y << B::z;

  Correct Answer: C

• Question 167:

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

  #include

  using namespace std;

  int compare(int, int);

  int main()

  {

  int x = compare(10, 20);

  cout << x;

  return 0;

  }

  int compare(int i, int j)

  {

  return i

  }

  A. It prints: 0

  B. It prints: 2

  C. It prints: 1

  D. It prints: 10

  Correct Answer: C

• Question 168:

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

  #include

  #include

  using namespace std;

  const int size = 3;

  class A {

  public:

  string name;

  A() { name = "Bob";}

  A(string s) { name = s;}

  A(A anda) { name = a.name;}

  };

  class B : public A {

  public:

  int *tab;

  B() { tab = new int[size]; for (int i=0; i

  B(string s) : A(s) { tab = new int[size]; for (int i=0; i

  ~B() { delete tab; }

  void Print() {

  for (int i=0; i

  cout << name;

  }

  };

  int main () {

  B b1("Alan");

  B b2;

  b1.tab[0]=0;

  b1.Print(); b2.Print();

  return 0;

  }

  A. It prints: Alan

  B. It prints: 111

  C. It prints: 011Alan111Bob

  D. It prints: 0

  Correct Answer: C

• Question 169:

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

  #include

  #include

  using namespace std;

  class A {

  public:

  int age;

  A () { age=5; };

  };

  class B : private A {

  string name;

  public:

  B () { name="Bob"; };

  void Print() {

  cout << name << age;

  }

  };

  int main () {

  B b,*ob;

  ob = andb;

  ob?>age = 10;

  ob?>Print();

  return 0;

  }

  A. It prints: Bob55

  B. It prints: Bob1

  C. It prints: 10

  D. Compilation error

  Correct Answer: D

• Question 170:

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

  #include

  #include

  using namespace std;

  class Second;

  class Base {

  int age;

  public:

  Base () { age=5; };

  friend void set(Base andob, Second andso);

  void Print() { cout << age;}

  };

  class Second {

  string name;

  public:

  friend void set(Base andob, Second andso);

  void Print() { cout << name;}

  };

  void set(Base andob, Second andso) {

  ob.age = 0; so.name = "Bill";

  }

  int main () {

  Base a;

  Second b;

  set(a,b);

  a.Print();

  b.Print();

  return 0;

  }

  A. It prints: 0Bill

  B. Compilation error

  C. It prints: Bill0

  D. None of these

  Correct Answer: A