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

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

• Question 141:

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

  #include

  #include

  using namespace std;

  class complex{

  double re, im;

  public:

  complex() : re(1),im(0.3) {}

  complex(double n) { re=n,im=n;};

  complex(int m,int n) { re=m,im=n;}

  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(1),c2(2),c3;

  c3 = c1 + c2;

  c3.Print();

  }

  A. It prints: 1 1.5
  B. It prints: 2 1.5
  C. It prints: 3 3
  D. It prints: 0 0
  C. It prints: 3 3

• Question 142:

  Which of the structures is incorrect?

  1: struct s1{ int x; long int li; }; 2: struct s2{ float f; struct s2 *s; };

  3:

  struct s3{ float f; struct s3 s; };

  A. 1
  B. 2
  C. 3
  D. 2, 3
  C. 3

• Question 143:

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

  #include

  using namespace std;

  class A {

  public:

  virtual void Print()=0;

  };

  class B:public A {

  public:

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

  };

  class C:public A {

  public:

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

  };

  int main()

  {

  B ob2;

  C ob3;

  A *obj;

  obj = andob2;

  obj?>Print();

  obj = andob3;

  obj?>Print();

  }

  A. It prints: BC
  B. It prints: CB
  C. It prints: CC
  D. It prints: BB
  A. It prints: BC

• Question 144:

  What is the output of the program if characters 'h', 'e', 'l', 'l' , 'o' and enter are supplied as input?

  #include

  #include

  using namespace std;

  void f();

  int main()

  {

  f();

  return 0;

  }

  void f()

  {

  char c;

  c = cin.get();

  cout << c;

  if(c != '\n')

  f();

  }

  A. It prints: hello
  B. It prints: olleh
  C. It prints: h
  D. It prints: o
  A. It prints: hello

• Question 145:

  The following declaration: int i = 0b10;

  A. is invalid
  B. sets variable i with an integer value equal to 10
  C. sets variable i with an integer value equal to 2 (10 binary)
  D. sets variable i with an integer value equal to 8 (10 octal)
  D. sets variable i with an integer value equal to 8 (10 octal)

• Question 146:

  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
  A. It prints: 0 0

• Question 147:

  What is the output of the program?

  #include

  #include

  using namespace std;

  int main()

  {

  string s1="Wo";

  string s2;

  s2 = s1;

  string s3;

  s3 = s2.append("rldHello");

  cout << s3;

  return( 0 );

  }

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

• Question 148:

  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";}

  };

  int main()

  {

  A *obj;

  A ob1;

  obj = andob1;

  obj?>Print();

  B ob2;

  obj = andob2;

  obj?>Print();

  }

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

• Question 149:

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

  #include

  using namespace std;

  int main()

  {

  int x=20;

  int *ptr;

  ptr = andx;

  cout<<*ptr;

  return 0;

  }

  A. It prints: 20
  B. It prints: 0
  C. It prints address of ptr
  D. It prints: 2
  A. It prints: 20

• Question 150:

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

  #include

  using namespace std;

  int x=5;

  static int y;

  int i=0;

  void static myFunction()

  {

  y=x++ + ++i;

  }

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

  {

  x++;

  myFunction();

  cout<

  }

  A. Compilation fails
  B. It prints: 5 5 0
  C. It prints: 7 7 1
  D. It prints: 6 5 1
  C. It prints: 7 7 1