int main ()
{
        double num = 0.0, sum = 0.0, average=0.0; 
 
        cout << "Enter a value -99 to end:"; 
        cin >> num; 
 
        while (num != -99)
        {
                sum = sum + num; 
                average = sum/num; 
 
                cout << "The average is:" << setprecision (2) << (double)average << endl << endl; 
 
                cout << "Enter another value -99 to end:"; 
                cin >> num; 
        }
        return 0; 
}

int main()
{
	double num = -99, sum = 0, average = 0, count = 0;
	std::cout << "Enter a value -99 to end:"; 
	std::cin >> num; 
 
	while (num != -99)
	{
                                count++;
		sum += num; 
		average = sum/count; 
 
		std::cout << "The average is:" << setprecision (2) << (double)average << endl << endl; 
 
		cout << "Enter another value -99 to end:"; 
		cin >> num; 
	}
	return 0;
}