// NestedDemo - input a series of numbers.
//              Continue to accumulate the sum
//              of these numbers until the user
//              enters a 0. Repeat the process
//              until the sum is 0.
#include <stdio.h> 
#include <iostream.h>

int main(int nArg, char* pszArgs[])
{
    // the outer loop
    cout << "This program sums multiple series\n"
         << "of numbers. Terminate each sequence\n"
         << "by entering a negative number.\n"
         << "Terminate the series by entering two\n"
         << "negative numbers in a row\n";

    // continue to accumulate sequences
    int nAccumulator;
    do
    {
        // start entering the next sequence
        // of numbers
        nAccumulator = 0;
        cout << "\nEnter next sequence\n";
 
        // loop forever
	    for(;;)
	    {
            // fetch another number
		    int nValue = 0;
		    cout << "Enter next number: ";
		    cin  >> nValue;

            // if it's negative...
		    if (nValue < 0)
		    {
                // ...then exit
			    break;
            }

            // ...otherwise add the number to the
            // accumulator
            nAccumulator = nAccumulator + nValue;
	    }

	    // output the accumulated result...
	    cout << "\nThe total is " 
            << nAccumulator 
            << "\n";

        // ...and start over with a new sequence
        // if the accumulated sequence was not zero
    } while (nAccumulator != 0);
    cout << "Program terminating\n";
    return 0;
}