end of file... weird action

Im compiling this with visual c++ .net and when i try and end the while loop with the end of file character ( control + z ) it drops me completely out of the console window.

Code:

---

#include <iomanip>
#include <ios>
#include <iostream>
#include <string>
// debug
#define DEBUG

using std::cin;                using std::setprecision;
using std::cout;        using std::string;
using std::endl;        using std::streamsize;

int main()
{
        // ask for / read students name
        cout << "Please enter your first name: ";
        string name;
        cin >> name;

        cout << "Hello, " << name << "!" << endl;

        // ask for / read mid term and final grades
        cout << "Please enter your mid-term and final grades: ";
        double mid, final;
        cin >> mid >> final;

        // +++++++++++++ DEBUG
        #ifdef DEBUG
        cout << "before while loop" << endl;
        cout << "enter to confirm" << endl;
        cin.ignore();
        cin.get();
        #endif       
        // ------------- eof DEBUG

        // ask for homework grades
        cout << "Enter all your homework grades, "
                        "followed by end-of-file: ";

        // the number and sum of grades read so far
        int count = 0;
        double sum = 0.0;

        // variable to temp the homework grades
        double x;
       
        // gather data
        while (cin >> x)
        {
                ++count;
                sum += x;
        }

        // +++++++++++++ DEBUG
        #ifdef DEBUG
        cout << "after while loop" << endl;
        cout << "enter to confirm" << endl;
        cin.ignore();
        cin.get();       
        #endif       
        // ------------- eof DEBUG
       
        // write result
        streamsize prec = cout.precision();
        cout << "Your final grade is " << setprecision(3)
                << (0.2 * mid) + (0.4 * final) + ((0.4 * sum) / count)
                << setprecision(prec) << endl;

        // pause
        cin.ignore();
        cin.get();

        return 0;
}

---

I thought this was something really stupid that i was missing but i loaded this cpp file up on my laptop and compiled it with microsoft visual c++ 6 ( the version before .net ) and it worked.... when i entered the end of file character ( control + z ) it carried on with the program and printed out my results.

Any ideas how to make this work on my visual studio .net version???????

also this is all on windows xp

You probably need a cin.clear() after the ctrl-z.

Even better would be to have them enter -1 instead of end-of-file.

gg

you are a genius, that cin.clear() seemed to fix her right up, thx! :eek:

What was actually happening that made it necessary to use the cin.clear()? so that i might avoid that same problem in programs to come.

thanks for solving my problem

later
sifurat

> What was actually happening that made it necessary to use the cin.clear()?
Well you typed ctrl-z, which is end of file
EOF is a sticky state, so any cin which follows it will immediately return EOF as well, up until you clear that condition.

Looks like VC6 was the buggy version, even though it did what you wanted