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

• Question 11:

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

  #include

  using namespace std;

  class BaseClass

  {

  public:

  int *ptr;

  BaseClass(int i) { ptr = new int(i); }

  ~BaseClass() { delete ptr; delete ptr;}

  void Print() { cout << *ptr; }

  };

  void fun(BaseClass x);

  int main()

  {

  BaseClass o(10);

  fun(o);

  o.Print();

  }

  void fun(BaseClass x) {

  cout << "Hello:";

  }

  A. It prints: Hello:1

  B. It prints: Hello:

  C. It prints: 10

  D. Runtime error.

  Correct Answer: D

• Question 12:

  What is the output of the program?

  #include

  #include

  using namespace std;

  struct Person {

  int age;

  };

  class First

  {

  Person *person;

  public:

  First() {person = new Person;

  person?>age = 20;

  }

  void Print(){

  cout << person?>age;

  }

  };

  int main()

  {

  First t[2];

  for (int i=0; i<2; i++)

  t[i].Print();

  }

  A. It prints: 10

  B. It prints: 2020

  C. It prints: 22

  D. It prints: 00

  Correct Answer: B

• Question 13:

  What is the output of the program?

  #include

  #include

  using namespace std;

  int main () {

  string s1 = "Hello", s2 = "World";

  s2 = s1 + s2;

  cout << s2;

  return 0;

  }

  A. It prints: Hello

  B. It prints: HelloWorld

  C. It prints: WorldHello

  D. It prints: WorldHelloWorld

  Correct Answer: B

• Question 14:

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

  #include

  using namespace std;

  int main (int argc, const char * argv[])

  {

  int a = 30, b = 1, c = 5, i=10;

  i = b < a < c;

  cout << i;

  return 0;

  }

  A. compilation fails

  B. It prints: 10

  C. It prints: 0

  D. It prints: 1

  Correct Answer: D

• Question 15:

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

  #include

  #include

  using namespace std;

  class B;

  class A {

  int age; public:

  A () { age=5; };

  friend class B;

  };

  class B {

  string name;

  public:

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

  void Print(A ob) {

  cout << name << ob.age;

  }

  };

  int main () {

  A a;

  B b;

  b.Print(a);

  return 0;

  }

  A. It prints: Bob5

  B. It prints: Bob

  C. It prints: 5

  D. None of these

  Correct Answer: A

• Question 16:

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

  #include

  using namespace std;

  void fun(int);

  int main()

  {

  int a=0;

  fun(a);

  return 0;

  }

  void fun(int n)

  {

  if(n < 2)

  {

  fun(++n);

  cout << n;

  }

  }

  A. It prints: 21

  B. It prints: 012

  C. It prints: 0

  D. None of these

  Correct Answer: A

• Question 17:

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

  #include

  using namespace std;

  class A {

  public :

  void print() {

  cout << "A ";

  }

  };

  class B {

  void print() {

  cout << "B ";

  }

  };

  int main() {

  B sc[2];

  A *bc = (A*)sc;

  for (int i=0; i<2;i++)

  (bc++)->print();

  return 0;

  }

  A. It prints: A A

  B. It prints: B B

  C. It prints: A B

  D. It prints: B A

  Correct Answer: A

• Question 18:

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

  #include

  using namespace std;

  int main(){

  int i = 1;

  if (--i==1) {

  cout << i;

  } else {

  cout << i-1;

  }

  return 0;

  }

  A. It prints: 0

  B. It prints: 1

  C. It prints: -1

  D. It prints: 2

  Correct Answer: C

• Question 19:

  What is the output of the program if character 2 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;

  }

  }

  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.

  B. It prints: int exception. Exception Nr. 20

  C. It prints: An exception occurred

  D. It prints: float exception. Exception Nr. 5.2

  Correct Answer: D

• Question 20:

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

  #include

  #include

  using namespace std;

  class complex{

  double re, im;

  complex() : re(1),im(0.4) {}

  complex operator?(complex andt);

  void Print() { cout << re << " " << im; }

  };

  complex complex::operator? (complex andt){

  complex temp;

  temp.re = this?>re ? t.re;

  temp.im = this?>im ? t.im;

  return temp;

  }

  int main(){

  complex c1,c2,c3;

  c3 = c1 ? c2;

  c3.Print();

  }

  A. It prints: 1 0.4

  B. It prints: 2 0.8

  C. It prints: 0 0

  D. It prints: 1 0.8

  Correct Answer: C