C++ Answers

Consider the code given below.

[Assume all the header files and namespaces included.]

How many times the following are invoked:

I) Default constructor

II) Parameterized constructor

III) Copy constructor

IV) Destructor

class test

{ int a;

public:

test(){a=0;}

test(int x) {a=x;}

test(const test &T){a=T.a;}

~test(){ }

test add(test X)

{ test T;

T.a=a+X.a;

return 0;

}

int main()

{ test t1(5),t2(10),t3;

t3=t1.add(t2);

return 0;

}

Consider a 20 *5 two-dimensional array marks which has its base address = 1000 and the size of an element = 2. Now compute the address of the element, marks[18][ 4] assuming that the elements are stored in row major order.

Complete the given code to get the output shown below:-

Base1

Base2

#include<iostream>

using namespace std;

class Base1 {

 public:

   void display()

   { cout<<"Base1"<<endl; } };

class Base2 {

public:

  void display()

   { cout<<"Base2"<<endl"; } };

class Derived: public Base1, public

Base2 {

  public:

 };

int main()

{

  Derived d;

  return 0;

}

Write the parameterized constructor for all the classes in the hierarchy.

class A

{ int a;}

Class B:public virtual A

{int b;}

Class C:public virtual A

{int c; }

Class D:public b,public C

{int d;}

Consider the class hierarchy shown below.

class A

{ int a;

protected:

int b;

public:

int c; };

class B: protected A

{ };

Class C: public B

{ };

Which data members of class A are accessible

- in class B

-in class C

-in main function

Justify your answer.

Include the function calls at appropriate places in the given program, to get the

output as shown below

In base

In derived

#include&lt;iostream&gt;

using namespace std;

class base

{ int b;

protected:

void display(){cout<<"In base\n";}

};

class derived:public base

{ int d;

  public:

void display(){ cout<<"In derived\n";}

};

int main()

{  derived D;

return 0;

}

Consider following code and state the order of execution constructors and order

of execution of destructors.

class C: public A, virtual public B

{ public:

C( ):A( ),B( )

{

cout<<”c class constructor”;

}

};

Consider following code and state the order of execution constructors and order

of execution of destructors.

class C: public A, virtual public B

{ public:

C( ):A( ),B( )

{

cout&lt;&lt;”c class constructor”;

}

};

Include the definition for the function ‘max_age’, in the program given below. The

function compares the data member age of the objects P1 and P2 and returns the

object having higher value for age.

class person

{ int age;

public:

person(int a){age=a;}

};

int main()

{ person P1(1.5);

person P2(2.5);

person P3=P1.max_age(P2);

}

Find the errors in the following program and correct them.

[Assume the necessary header files and namespaces included]

class test

{ static int x;

int y;

public:

test( ){x=0;y=0;}

static void display()

{ cout&lt;&lt;x&lt;&lt;”\t”&lt;&lt;y&lt;&lt;endl; }

void output()

{cout&lt;&lt;x&lt;&lt;”\t”&lt;&lt;y&lt;&lt;endl;}

};

int main()

{ test T1;

T1.display();

test::output();

return 0;

}