slips 14

/* Slip no : 14_1 Write a C++ program to create a class Book which contains data members as B_Id, B_Name, B_Author, B_Publication. Write member functions to accept and display Book information also display Count of books. (Use Static data member to maintain Count of books) */

#include<iostream.h>

#include<conio.h>

class book

{

                int id;

                char name[20],author[20],pub[20];

                static int cnt;

                public:

                void getdata()

                {

                                cout<<"\nEnter book id : ";

                                cin>>id;

                                cout<<"\nEnter book name : ";

                                cin>>name;

                                cnt++;

                                cout<<"\nEnter author name : ";

                                cin>>author;

                                cout<<"\nEnter publication : ";

                                cin>>pub;

                }

                void display()

                {

                                //cout<<"\n\n*************OUTPUT*****************";

                                cout<<"\nbook id = "<<id;

                                cout<<"\nbook name = "<<name;

                                cout<<"\nAuthor name = "<<author;

                                cout<<"\npublication = "<<pub;

                }

                static void no_of_book()

                {

                                cout<<"\nNumber of book = "<<cnt;

                }

};

int book::cnt;

void main()

{

                clrscr();

                book b[20];int n;

                cout<<"\nEnter no f Books : ";

                cin>>n;

                for(int i=0;i<n;i++)

                                b[i].getdata();

                cout<<"\n Book Information are : \n \n";

                for( i=0;i<n;i++)

                                b[i].display();

                b[i-1].no_of_book();

                getch();

}

/* Slip no : 14_2 Create a base class Shape. Derive three different classes Circle, Rectangle and Triangle from Shape class. Write a C++ program to calculate area of Circle, Rectangle and Triangle. (Use pure virtual function). */

#include<iostream.h>

#include<conio.h>

class shape

{

public:

virtual void accept()=0;

virtual void area()=0;

};

class circle:public shape

{

public:

int r;

void accept()

{

  cout<<"\n Enter radius for circle : ";

  cin>>r;

}

void area()

{

  cout<<"\n Area of circle="<<3.14*r*r;

}

};

class rectangle:public shape

{

public:

int l,b;

void accept()

{

  cout<<"\n Enter length and breadth for rectangle : ";

  cin>>l;

  cin>>b;

}

void area()

{

   cout<<"\n Area of rectangle="<<l*b;

}

};

class triangle:public shape

{

  public:

  int b,h;

  void accept()

  {

     cout<<"\n Enter base and height for triangle : ";

     cin>>b;

     cin>>h;

  }

  void area()

  {

     cout<<"\n Area of triangle="<<0.5*b*h;

  }

};

void main()

{

     triangle t;

     circle c;

     rectangle r;

     shape *ptr;

     clrscr();

     ptr=&t;

     ptr->accept();

     ptr->area();

     ptr=&c;

     ptr->accept();

     ptr->area();

     ptr=&r;

     ptr->accept();

     ptr->area();

     getch();

}