//      File name: modify.cpp
//          Topic: file input/output in C++
//        Created: March 13, 2000
//         Author: Elena Machkasova

#include <iostream.h>
#include <fstream.h>    // using file input-output
#include <ctype.h>      // using islower, toupper

int main()
{
   // a character variable to read character-by-character
   char c;

   // declare input and output streams
   ifstream inFile;
   ofstream outFile;

   // Exercise 2: open input and output files:
   // input file: data, output file: result2

   // checking if the files have opened correctly:
   if (!inFile) {
       //print error message to standard error stream:
       cerr << "Can not open input file" << endl;
       exit(1);
   }

   if (!outFile) {
       //print error message to standard error stream:
       cerr << "Can not open output file" << endl;
       exit(1);
   }

   // input-outpur loop goes until the end of file 
   // There is no wrong data for unformatted character-by-character input

   // Exercise 2: input a character c using method get(c) in the condition
   // of the while loop: 
   while ( ) {
       // if c is a lower-case letter, convert it to upper case
       if (islower(c))
	   c = toupper(c);
       // Exercise 2: output c to the output file using put(c) method:

   }

   // Exercise 2: close input and output files:
   
   

   return 0;
}