#include <iostream.h>  
  #include <fstream.h>
  #include <stdlib.h>
  #include <stdio.h>
 
    main ()
    {
 
    fstream file1;
    fstream file2;
 
    int i, a, b, c, d; 
 
    srand(time(NULL));
 
 
      cout << "how many times ";
      cin >> d;
 
      for( c = 1;   c <= d;c++ )
      {
 
     // *****************************
 
      cout << endl;      
      cout << " try " << c << " ";
 
 
      // writing to file
      file1.open( "test.dat", ios::out); 
 
      if (!file1) 
       {
       cerr << "Unable to open test.dat 1.";
       exit(1);
       }
 
      for( i = 1;   i <= 5;i++ )
      {
       a = (rand() % 100) + 1; // random nunber from 1 to 100       
       file1 << a << endl;   // write to file  
       }
       file1.close();
 
       // reading from file
       file2.open( "test.dat", ios::in); 
       if (!file2) 
       {
       cerr << "Unable to open test.dat 2.";
       exit(1);
       }
       while( !file2.eof() )
       {
       file2 >> b;
       cout << b << " ";
       }
       file2.close();  
   }    
}