// fileinout1.cpp 		By: Aiman Hanna - ©2006 Aiman Hanna

// This program illustrates how a program can read from an input file
// and writes to an output file. 

// Key Points: 	1) Physical file names and logical file names.
//		2) ifstream and ofstream classes
//		3) eof() function


#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>

void ShowFile( char* infilename )
{
 // This function reads an input file line by line and shows the lines on the screen. 

 // The input file is assumed to have lines formatted as follows:
 // 	string	int    double   char, where are values are separated by tabs
 // For example: 	Mark	30	12.3	k
 //			Martin  23	14.8	j
 
 char* st = new char[20];
 int x;
 double d;
 char ch;

 ifstream fin;
 ofstream fout;

 fin.open( infilename );      // from this point, fin is the logical name of infilename

 if (!fin )	// if you can not open the file
 {
  cerr << " Could not open input file: " << infilename << endl;
  exit( 1 );
 }
 
 // Read the first line from the input file, the following while will check
 // whether the input attempt was successful or not

 fin >> st >> x >> d >> ch;	
 
  while ( !fin.eof() )	// As long as it is not the end of the input file yet
 {
  cout << st << "\t"  << x  << "\t" << d  << "\t" << ch << endl;
  fin >> st >> x >> d >> ch;	
 }

 // close the file before terminating
 fin.close();
}



void CopyFile1( char* infilename, char* outfilename )
{
 // This function reads an input file and copies it to an output file
 // The input file is assumed to have lines formatted as follows:
 // 	string	int double   char, where are values are separated by tabs
 // For example: 	Mark	30	12.3	k
 //			Martin  23	14.8	j
 
 char* st = new char[20];
 int x;
 double d;
 char ch;

 ifstream fin;
 ofstream fout;

 fin.open( infilename );      // from this point, fin is the logical name of infilename

 if (!fin )	// if you can not open the file
 {
  cerr << " Could not open input file: " << infilename << endl;
  exit( 1 );
 }

  fout.open( outfilename );  // from this point, fout is the logical name of outfilename

 if (!fout )	// if you can not open the file
 {
  cerr << " Could not open output file: " << outfilename << endl;
  fin.close();		// close the input file first.
  exit( 1 );
 }


 // Read the first line of the input file 
 fin >> st >> x >> d >> ch;

 while ( !fin.eof() )	// As long as it is not the end of the input file yet
 {
  fout << st << "\t"  << x  << "\t" << d  << "\t" << ch << endl;
  fin >> st >> x >> d >> ch;
 }

 // close the file before terminating
 fin.close();
 fout.close();
}


void CopyFile2( char* infilename, char* outfilename )
{
 // This function reads an input file and copies it to an output file
 // The lines of the input file are formatted as follows:
 // The first line includes a date, which is day/month/year
 // The second line includes three double values
 // All following lines are formatted as follows:
 // 	string	int double   char, where are values are separated by tabs
 // For example: 	Mark	30	12.3	k
 //			Martin  23	14.8	j
 
 char* st = new char[20];
 int day, month, year, x;
 double d1, d2, d3, d;
 char ch, slash;

 ifstream fin;
 ofstream fout;

 fin.open( infilename );      // from this point, fin is the logical name of infilename

 if (!fin )	// if you can not open the file
 {
  cerr << " Could not open input file: " << infilename << endl;
  exit( 1 );
 }

  fout.open( outfilename );  // from this point, fout is the logical name of outfilename

 if (!fout )	// if you can not open the file
 {
  cerr << " Could not open output file: " << outfilename << endl;
  fin.close();		// close the input file first.
  exit( 1 );
 }


 // Read the first two lines of the input file at once  
 fin >> day >> slash >> month >> slash >> year >> d1 >> d2 >> d3;
 fout << day << slash << month << slash << year << endl
      << d1 << " " << d2 << " " << d3 << endl;
 
 fin >> st >> x >> d >> ch;
 // Read the 3rd line, which is the first one of many similar lines
 while ( fin )	// As long as the file is not finished. This is the same as
 //		        // while ( !fin.eof() )	
  {
  fout << st << "\t"  << x  << "\t" << d  << "\t" << ch << endl;
  fin >> st >> x >> d >> ch;
 }

 // close the file before terminating
 fin.close();
 fout.close();
}


void CopyFile3( char* infilename, char* outfilename )
{
 // This function reads an input file and copies it to an output file
 // The format of the input file is unknown 
  
 char ch;

 ifstream fin;
 ofstream fout;

 fin.open( infilename );      // from this point, fin is the logical name of infilename

 if (!fin )	// if you can not open the file
 {
  cerr << " Could not open input file: " << infilename << endl;
  exit( 1 );
 }

  fout.open( outfilename );  // from this point, fout is the logical name of outfilename

 if (!fout )	// if you can not open the file
 {
  cerr << " Could not open output file: " << outfilename << endl;
  fin.close();		// close the input file first.
  exit( 1 );
 }


 // Attempt to read the first character from the input file. 
  
 fin.get(ch);

 while ( fin )	// Check if the read attempt was successful
 			// and continue to read as long as it is not
			// the end of the input file yet
 {
  fout.put(ch);		// copy the character to the output file
  fin.get(ch);
 }

 // close the file before terminating
 fin.close();
 fout.close();
}



int main ()
{
 ShowFile( "payroll.txt" );

 CopyFile1( "payroll.txt", "payroll.copy.txt");

 CopyFile2( "payroll2.txt", "payroll2.copy.txt");

 CopyFile3( "news.txt", "news.copy.txt");

 return 0;
}

/* The output of running the program
mark    12      19.3    p
jhon    16      23.4    f
Smith   23      15.3    p
jack    12      34.5    f
nancy   35      29.6    f

*/

// In addition, the files payroll.copy.txt, payroll2.copy.txt and news.copy.txt are created


/*
======== payroll.txt =====
mark    12      19.3    p
jhon    16      23.4    f
Smith   23      15.3    p
jack    12      34.5    f
nancy   35      29.6    f

======== payroll.copy.txt - Created after you run the program =====
mark    12      19.3    p
jhon    16      23.4    f
Smith   23      15.3    p
jack    12      34.5    f
nancy   35      29.6    f

======== payroll2.txt ========
18/4/1987
0.23 0.12 0.32
mark    12      19.3    p
jhon    16      23.4    f
Smith   23      15.3    p
jack    12      34.5    f
nancy   35      29.6    f

======== payroll2.copy.txt - Created after you run the program ========
18/4/1987
0.23 0.12 0.32
mark    12      19.3    p
jhon    16      23.4    f
Smith   23      15.3    p
jack    12      34.5    f
nancy   35      29.6    f


======== news.txt =========

Cisco makes deal to push digital video over cable
     By Ben Heskett
     Staff Writer, CNET News.com
     November 11, 1999, 10:40 a.m. PT

     Cisco Systems made further moves into the cable networking equipment market today, acquiring start-up V-Bits for
     $128 million in stock.
 
 
 
 ======== news.copy.txt - Created after you run the program =========

Cisco makes deal to push digital video over cable
     By Ben Heskett
     Staff Writer, CNET News.com
     November 11, 1999, 10:40 a.m. PT

     Cisco Systems made further moves into the cable networking equipment market today, acquiring start-up V-Bits for
     $128 million in stock.

*/