Prog-7

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<conio.h>

#include<fstream.h>

#include<iostream.h>

void writeLists()

{

  fstream out1,out2;

  int i,m,n;

  char name[20];

 out1.open("file1.txt",ios::out);

 out2.open("file2.txt",ios::out);

  if( (!out1) || (!out2) )

 {

  printf("Unable to open one of the list files ");

  getch();

  exit(0);

 }

  cout<<"Enter the number of names you want to enter in file1 ";

 cin>>m;

 cout<<"\nEnter the names in assending order \n";

 for(i=0;i<m;i++)

 {

  cin>>name;

  out1<<name;

  out1<<'\n';

 }

 cout<<"Enter the number of names you want to enter in file2 ";

 cin>>n;

 cout<<"\nEnter the names in assending order \n";

 for(i=0;i<n;i++)

 {

  cin>>name;

  out2<<name;

  out2<<'\n';

 }

 out1.close();

 out2.close();

}

void main()

{

 char list1[100][20],list2[100][20];

 int i,j,m,n;

 clrscr();

 fstream out1,out2,out3;

 writeLists();

  out1.open("file1.txt",ios::in);

 out2.open("file2.txt",ios::in);

 out3.open("file3.txt",ios::out);

 if((!out3)||(!out1)||(!out2))

 {

  printf("Unable to open one of the file");

  getch();

  exit(0);

 }

 clrscr();

 m=0;

 n=0;

 while(!out1.eof())

 {

   out1.getline(list1[m],20,'\n');

   cout<<list1[m];

   m++;

 }

  while(!out2.eof())

 {

   out2.getline(list2[n],20,'\n');

   cout<<list2[n];

   n++;

 }

 m--;

 n--;

 i=0;

 j=0;

 cout<<"\nElements common to both files are \n ";

 while(i<m&&j<n)

 {

  if(strcmp(list1[i],list2[j])==0)

  {

   out3<<list1[i];  cout<<list1[i]<<"\n";

   out3<<'\n';

   i++;

   j++;

  }

  else if(strcmp(list1[i],list2[j])<0)

  {

   i++;

  }

  else

  { j++;}

 }getch();

}