SOURCE FILE: sumDoer.cpp

/* This is a program that reads 7 numbers from a file into an array,
   calculates the sum of the items in the array, and then 
   writes the sum to the screen. */

#include <iostream> 
#include <fstream> 
using namespace std ; 

const int SIZE = 7;
const int STRING_MAX = 256 ;

int main (void) 
{
   double data[SIZE] ;
   char fileName[STRING_MAX] ;
   double sum ;
   int index ;

   cout << "Please type the name of the 'from' file: " ;
   cin >> fileName ;

   ifstream fin ;
   fin.open(fileName) ;
   if (fin.fail())
   {
      cout << "FAILED TO OPEN INPUT FILE: " << fileName << endl ;
      exit(1) ;
   }

   for (index=0; index<SIZE; index++ )
   {
      fin >> data[index] ;
   }
   fin.close() ;

   sum = 0 ; //important starter value

   for (index=0; index<SIZE; index++ )
   {
      sum = sum + data[index] ;
   }

   cout.setf(ios::fixed) ;
   cout.setf(ios::showpoint) ;
   cout.precision(2) ;

   cout << "\nThe sum of the array values is: " << sum << endl << endl ;

   return 0; 
}