//--------------------------------------------------------------------
//
//  Example showing the use of the open() function       infile2.cpp
//
//--------------------------------------------------------------------

// Reads the first five integer values from a user-specified input
// file and displays their sum.

#include <iostream.h>  // For cin and cout
#include <fstream.h>   // For file input/output

void main()
{
    ifstream inFile;    // Input file stream
    char filename[21];  // Input file name
    int num,            // Number read from file
        sum = 0;        // Sum of numbers read in

    // Get the file name.
    cout << "Enter file name (try values.dat): ";
    cin >> filename;

    // Alternate method of opening an input file.
    // flag ios::nocreate indicates that the file open
    // operation should fail if there is no such file.
    inFile.open(filename,ios::nocreate);

    // Check that input file opened correctly.
    if ( !inFile )
       cout << "File " << filename << " could not be opened for input"
            << endl;
    else
    {
       // Read in numbers and compute their sum.
       for ( int j = 0 ; j < 5 ; j++ )
       {
           inFile >> num;
           cout << num  << endl;
           sum += num;
       }

       // Output the sum.
       cout << "Sum = " << sum << endl << endl;

       // Close the input file stream.
       inFile.close();
    }
}