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

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

• Question 221:

  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:public A {

  public:

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

  };

  class C:public B {

  public:

  void Print(){ cout<< "C";}

  };

  int main()

  {

  A ob1;

  B ob2;

  C ob3;

  B *obj;

  obj = andob2;

  obj?>Print();

  obj = andob3;

  obj?>Print();

  }

  A. It prints: BB
  B. It prints: AA
  C. It prints: BC
  D. It prints: AB
  C. It prints: BC

• Question 222:

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

  #include

  using namespace std;

  int getValue();

  int main()

  {

  const int x = getValue();

  cout<

  return 0;

  }

  int getValue()

  {

  return 5;

  }

  A. It will print 0
  B. The code will not compile.
  C. It will print 5
  D. It will print garbage value
  C. It will print 5

• Question 223:

  What is the output of the program given below?

  #include

  using namespace std;

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

  {

  float f=?10.501;

  cout<<(int)f;

  }

  B. 11
  C. ?10
  D. ?11
  C. ?10

• Question 224:

  What is the output of the program?

  #include

  #include

  using namespace std;

  class First

  {

  string name;

  public:

  First() {

  name = "Alan";

  }

  void setName(string n) {this?>name = n;}

  void setName() {this?>name = "John";}

  void Print(){

  cout << name;

  }

  };

  int main()

  {

  First ob1,*ob2;

  ob2 = new First();

  First *t;

  t = andob1;

  t?>setName();

  t?>Print();

  t = ob2;

  t?>setName("Steve");

  ob2?>Print();

  }

  A. It prints: JohnSteve
  B. It prints: AlanAlan
  C. It prints: AlanSteve
  D. It prints: JohnAlan
  A. It prints: JohnSteve

• Question 225:

  Which of the following statements are true? (Choose two.)

  A. Class A's friend's friend is also a friend of class A
  B. Friendship is inherited
  C. A class may be a friend of many classes
  D. A class may have many friends
  C. A class may be a friend of many classes
  D. A class may have many friends

• Question 226:

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

  #include

  using namespace std;

  class A {

  public:

  int x;

  };

  class B : public A {

  public:

  B() { x=1;}

  B(int x) {this?>x = x;}

  };

  int main () {

  B c1;

  B c2(10);

  cout << c1.x;

  cout << c2.x;

  return 0;

  }

  A. It prints: 010
  B. It prints: 110
  C. It prints: 00
  D. It prints: 1
  B. It prints: 110

• Question 227:

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

  #include

  #include

  using namespace std;

  class A {

  public:

  A() { cout << "A0 ";}

  A(string s) { cout << "A1";}

  };

  class B : public A {

  public:

  B() { cout << "B0 ";}

  B(string s) { cout << "B1 ";}

  };

  class C : private B {

  public:

  C() { cout << "C0 ";}

  C(string s) { cout << "C1 ";}

  };

  int main () {

  B b1;

  C c1;

  return 0;

  }

  A. It prints: A0 B0 A0 B1 A0 C0 A0 C1
  B. It prints: B0 B1 C0 C1
  C. It prints: A0 B0 A0 B0 C0
  D. It prints: B0 B1
  C. It prints: A0 B0 A0 B0 C0

• Question 228:

  Which code line inserted instead of the comment below will cause the program to produce the expected output?

  

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

• Question 229:

  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
  A. It prints: A A

• Question 230:

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

  

  A. It prints: 3.14
  B. It prints: Scring
  C. It causes a compilation error
  D. It prints: x
  D. It prints: x