#include <fstream>
#include <iostream>

int main()
{

    using namespace std;
    // This will take the file into the program
    ifstream in_stream;

    cout << "I am going to take the numbers from the input file and average them." << endl;

    // Opens the input file.
    in_stream.open ( "input.dat" );

    // If the file fails to open it will close the program and output the statement.
    if ( in_stream.fail( ) )
    {
        cout << "Please check if the file is saved properly. It could not open." << endl;
    }

    // Declares the variables to get the average
    double temp, sum = 0;
    int i = 0;
    double average;

    // Loops the file until no more numbers can be read
    while (in_stream >> temp)
    {
    sum += temp;
    ++i;
    }

    // Final average
    average= sum / i;

    // Outputs the average to the screen
    cout << "The average of the numbers is ";
    cout << average;
    cout << endl;

    // Closes the file
    in_stream.close ();

    cout << "The program will now close." << endl;

}