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

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

• Question 151:

  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
  A. It prints: 4John

  ---

  Explanation/Reference:

• Question 152:

  What is the output of the program?

  #include

  #include

  using namespace std;

  int main()

  {

  string s1[]= {"Hello" , "World" };

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

  cout << s1[i];

  }

  return( 0 );

  }

  A. It prints: HelloWorld
  B. It prints: Hello
  C. It prints: WorldHello
  D. It prints: World
  A. It prints: HelloWorld

• Question 153:

  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
  C. Runtime error.

• Question 154:

  What is the output of the program given below?

  #include

  using namespace std;

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

  {

  enum state { ok, error, warning};

  enum state s1, s2, s3, s4;

  s1 = ok;

  s2 = warning;

  s3 = error;

  s4 = ok;

  cout << s1<< s2<< s3<< s4;

  return 0;

  }

  A. 1234
  B. compilation fails
  C. 0210
  D. 1322
  C. 0210

• Question 155:

  Which line of code inserted instead of the comment will make the following code run properly without causing memory leaks?

  

  A. ~Base() ( delete this; }
  B. no additional code is needed
  C. ~Base() { delete ptr; delete ptr; }
  D. ~Base() { delete ptr; }
  D. ~Base() { delete ptr; }

• Question 156:

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

  #include

  #include

  using namespace std;

  class A {

  protected:

  int y;

  public:

  int x,z;

  A() : x(2), y(2), z(1) { z = x + y; }

  A(int a, int b) : x(a), y(b) { z = x + y;}

  void Print() { cout << z; }

  };

  class B : public A {

  public:

  int y;

  B() : A() {}

  B(int a, int b) : A(a,b) {}

  void Print() { cout << z; }

  };

  int main () {

  A b;

  b.Print();

  return 0;

  }

  A. It prints: 4
  B. It prints: 0
  C. It prints: 3
  D. It prints: 2
  A. It prints: 4

  ---

  Explanation/Reference:

• Question 157:

  Which of the following is a logical operator?

  A. and
  B. andand
  C. ||
  D. !
  B. andand
  C. ||
  D. !

• Question 158:

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

  #include

  #include

  using namespace std;

  int fun(int);

  int main()

  {

  int *x = new int;

  *x=10;

  cout << fun(*x);

  return 0;

  }

  int fun(int i)

  {

  return i*i;

  }

  A. It will print: 100
  B. It will print: 101
  C. It will print: 10
  D. It will print: 1
  A. It will print: 100

• Question 159:

  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 {

  public:

  void set() {

  y = 4; z = 2;

  }

  void Print() {

  cout << y << z;

  }

  };

  int main () {

  B b;

  b.set();

  b.Print();

  return 0;

  }

  A. It prints: 42
  B. It prints: 44
  C. It prints: 22
  D. It prints: 2
  A. It prints: 42

  ---

  Explanation/Reference:

• Question 160:

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

  #include

  #include

  using namespace std;

  class A {

  protected:

  int y;

  public:

  int x,z;

  A() : x(1), y(2), z(0) { z = x + y; }

  A(int a, int b) : x(a), y(b) { z = x + y;}

  void Print() { cout << z; }

  };

  class B : public A {

  public:

  int y;

  B() : A() {}

  B(int a, int b) : A(a,b) {}

  void Print() { cout << z; }

  };

  int main () {

  A b;

  b.Print();

  return 0;

  }

  A. It prints: 3
  B. It prints: 0
  C. It prints: 1
  D. It prints: 2
  A. It prints: 3

  ---

  Explanation/Reference: