/*   input file failure example
    
                                   file: 3ex3.cpp   
   FALL 2001
   ___________________________________
   Jacob Y. Kazakia   jyk0
   May 2, 2001
   Programming example  3 of unit #3
   Recitation Instructor: J.Y.Kazakia
   Recitation Section  01
   ___________________________________

   Purpose: This program reads a sequence of  numbers which are written in a
            file called 3ex3data.txt  
	    The file looks like this:

	    1.00345       4.567       1.89e-03

            2.345          1.78
            2.897e-6      123.678      34

            We assume that the user does NOT know, ahead of time, how many 
	    numbers are listed.  The task of the program is to output
	    the numbers to the screen and calculate the sum.

   Algorithm:  A stream named ex3input is established. A while loop
            provides repeated reading of numbers.  The condition of
	    the loop is set to
			
			  while ( ! ex3input.eof() )
            
            When the stream 3ex3input reaches the END OF FILE then
            ex3input.eof() evaluates to TRUE. As long as we are not
            at the end it evaluates to FALSE and consequently the 
            prefixed  !  is needed.              
                                                         */


#include<fstream.h>          // header needed for file input output

void main()
{

ifstream ex3input ( "3ex3data.txt", ios :: in);

float number ;     
float sum = 0;
 
ex3input >> number; 
 
cout << "\n\n This is the list of numbers read \n\n";
 
while ( ! ex3input.eof() )      // read the numbers and add them up
  {
    
	cout << number << endl;

	sum = sum + number;

	ex3input >> number;

   }

 cout << "\n\n  End of file reached. The sum is : " ;
 cout << sum;
 

cout << " \n\n  Enter e(exit) to exit    ...";
char hold;
cin >> hold;

}

 /*     THE OUTPUT :


  

 This is the list of numbers read

1.00345
4.567
0.00189
2.345
1.78
2.897e-006
123.678
34


  End of file reached. The sum is : 167.375

  Enter e(exit) to exit    ...


*/