//program to enter the details of books
#include<iostream.h>
#include<conio.h>
#include<process.h>
#include<fstream.h>
#include<stdio.h>

struct BOOK
{ int BookNo;
  char BookTitle[20];
  int Price;
  int Edition;
}obj;
void main()
{ clrscr();
  int no;
  char p;

  ofstream ofile;
  ofile.open("BOOKS.DAT",ios::app|ios::binary) ;
  if(!ofile)
  { cout<<"\n File can not open";
exit(1);
  }

  do
  { cout<<"\n Enter the book no:";
cin>>obj.BookNo;
cout<<"\n Enter the book title:";
gets(obj.BookTitle);
cout<<"\n Enter the price of book:";
cin>>obj.Price;
cout<<"\n Enter the Edition:";
cin>>obj.Edition;
ofile.write((char*)&obj,sizeof(obj));
cout<<"\n Do you want to continue:";
cin>>p;
  }while(p=='y'||p=='Y');
  ofile.close();
  ifstream ifile;
  ifile.open("BOOKS.DAT",ios::in|ios::binary);
  if(!ifile)
  { cout<<"\n File can not read";
exit(1);
  }
  int flag=0;
  cout<<"\n Enter the book number whose details you want to search:";
  cin>>no;

  while(ifile.read((char *)&obj,sizeof(obj)))
  { if(obj.BookNo==no)
       {flag=1;
cout<<"\n  the book no:"<<obj.BookNo;
cout<<"\n  the book title:"<<obj.BookTitle;
cout<<"\n the price of book:"<<obj.Price;
cout<<"\n  the number of copies:"<<obj.Edition;
break;
      }
  }
  if(flag==0)
cout<<"Record not found";

  ifile.close();
  getch();
}

//program to find the sum of two matrices by using objects
#include<iostream.h>
#include<conio.h>
class MATRIX
{ private:
  int a[20][20];
  int m;
  int n;
 public:
  void enter();
  void display();
  void add_mat(MATRIX,MATRIX);
} obj;
void MATRIX::enter()
{cout<<"\n Enter the number of rows:";
 cin>>m;
 cout<<"\n Enter the number of columns:";
 cin>>n;
 cout<<"\n Enter the elements of matrix:";
  for(int i=0;i<m;i++)
  { for(int j=0;j<n;j++)
{ cout<<"\n Enter a["<<i<<"]["<<j<<"]:";
cin>>a[i][j];
}
  }

 }
void MATRIX::display()
{
  cout<<"\n matrix is:";
  for(int i=0;i<m;i++)
  { cout<<"\n";
for(int j=0;j<n;j++)
cout<<a[i][j]<<" ";
  }
}
void MATRIX::add_mat(MATRIX A1,MATRIX A2)
{     if(A1.m==A2.m && A1.n==A2.n)
      {
obj.m=A1.m;
obj.n=A2.n;
for(int i=0;i<A1.m;i++)
for(int j=0;j<A2.n;j++)
{
obj.a[i][j]=A1.a[i][j]+A2.a[i][j];
}
cout<<"\n Addition of matrices:";
obj.display();
      }
     else
     {
      cout<<"\n\nMatrices cannot be added!!!";
      getch();
     }
}
void main()
{ clrscr();
  MATRIX a1,a2,a3;
  a1.enter();
  a1.display();
  a2.enter();
  a2.display();
  a3.add_mat(a1,a2);
  getch();
  }