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

• Question 1:

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

  #include

  using namespace std;

  void set(struct person*);

  struct person

  {

  int age;

  };

  int main()

  {

  struct person e = {18};

  set(ande);

  cout<< e.age;

  return 0;

  }

  void set(struct person *p)

  {

  p?>age = p?>age + 1;

  }

  A. It prints: 18

  B. It prints: 19

  C. It prints: 20

  D. It prints: 0

  Correct Answer: B

• Question 2:

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

  #include

  using namespace std;

  int main()

  {

  int x=2, *y, z=3;

  y = andz;

  cout<

  return 0;

  }

  A. It prints: 36

  B. It prints: 14

  C. It prints: 16

  D. Compilation error

  Correct Answer: D

• Question 3:

  What is the output of the program?

  #include

  using namespace std;

  int main()

  {

  int tab[4]={10,20,30,40};

  tab[1]=10;

  int *p;

  p=andtab[0];

  cout<<*p;

  return 0;

  }

  A. It prints: 10

  B. It prints: 20

  C. It prints: 11

  D. It prints: 30

  Correct Answer: A

• Question 4:

  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;

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

  };

  class B : public A {

  string z;

  public:

  void set() {

  y = 4;

  z = "John";

  }

  void Print() {

  cout << y << z;

  }

  };

  int main () {

  B b;

  b.set();

  b.Print();

  return 0;

  }

  A. It prints: 4John

  B. It prints: 2John

  C. It prints: 23

  D. It prints: 43

  Correct Answer: A

• Question 5:

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

  #include

  #include

  using namespace std;

  class A {

  public:

  int x;

  A() { x=0;}

  };

  class B {

  public:

  int x;

  B() { x=1;}

  };

  class C :public A, public B {

  public:

  int x;

  C(int x) {

  this?>x = x;

  A :x = x + 1;

  }

  void Print() { cout << x << A::x << B::x; }

  };

  int main () {

  C c2(1);

  c2.Print();

  return 0;

  }

  A.

  It prints: 1

  B.

  It prints: 121

  C.

  It prints: 111

  D.

  It prints: 2

  Correct Answer: B

• Question 6:

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

  #include

  using namespace std;

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

  {

  int x,y;

  union t

  {

  char tab[2];

  int i;

  };

  union t u;

  u.tab[0] = 1;

  u.tab[1] = 2;

  u.i

  = 0;

  x = u.tab[0];

  y = u.tab[1];

  cout << x << "," << y << "," << u.i;

  return 0;

  }

  A.

  compilation fails

  B.

  It prints: 0,0,0

  C.

  It prints: 1,2,0

  D.

  None of these

  Correct Answer: B

• Question 7:

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

  #include

  using namespace std;

  int main()

  {

  int x=2, *y;

  y = andx;

  cout << *y + x;

  return 0;

  }

  A. It prints: 1

  B. It prints: 2

  C. It prints: 4

  D. It prints: 0

  Correct Answer: C

• Question 8:

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

  #include

  using namespace std;

  int main()

  {

  int x=0;

  int *ptr;

  ptr = andx;

  cout<

  return 0;

  }

  A. It prints: 0 0

  B. It prints address of ptr

  C. It prints: 1

  D. It prints: 2

  Correct Answer: A

• Question 9:

  Which of the following statements are correct about an array? int tab[10];

  A. The array can store 10 elements.

  B. The expression tab[1] designates the very first element in the array.

  C. The expression tab[9] designates the last element in the array.

  D. It is necessary to initialize the array at the time of declaration.

  Correct Answer: AC

• Question 10:

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

  #include

  #include

  using namespace std;

  class First

  {

  string *s;

  public:

  First() { s = new string("Text");}

  ~First() { delete s;}

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

  };

  int main()

  {

  First FirstObject;

  FirstObject.~First();

  }

  A. It prints: Text

  B. Compilation error

  C. Runtime error.

  D. None of these

  Correct Answer: C