numberthing.cpp

#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>

using namespace std;

int main ()
{
    // Declarations
    string reply;
    double number;
    double total;
    int count;
    string inputFileName;
    ifstream inputFile;
	
    cout << fixed << showpoint << setprecision(2);
    cout << "Input file name: ";
    getline(cin, inputFileName);
    // Open the input file.
    inputFile.open(inputFileName.c_str());      // Need .c_str() to convert a C++ string to a C-style string
    // Check the file opened successfully.
    if ( ! inputFile.is_open()) {
        cout << "Unable to open input file." << endl;
        cout << "Press enter to continue...";
        getline(cin, reply);
        exit(1);
    }
	
    count = 0;       // Must initialize the counter to zero
    total = 0;       // Must initialize the accumulator to zero.
	
    // The while statement reads the next token into 'number'
    // It returns a value of 'false' at end-of-file, which terminates the loop.
    while (inputFile >> number) {
        count++;     // Increment the counter
        cout << setw(5) << count << setw(20) << number << endl;
        total += number;
    }
	
    cout << "The total is: " << setw(11) << total << endl;
    // Be careful not to divide by zero!
    if (count > 0) {
        cout << "The average is: " << setw(9) << total/count << endl;     
    }
	
    // Close the input file stream
    inputFile.close();
    cout << "Press enter to continue...";
    getline(cin, reply);
    return 0;	
}