#include "stdafx.h"
# include <iostream>
using namespace std;
 
int _tmain(int argc, _TCHAR* argv[])
{
	int product;
		int b;
	int i;
	i=0;
	float sum;
	sum=1;
	{
	while (b>=0) 
		i++;
				//enter values
		cout<<"Enter a number\n";
		cin>> b ;
		cin>> product;
		sum=product*b;
	}
	cout<<"Nunbers multiplied together equals "<<sum<<endl;
	cin>>b;
	if(i<0){
		i++;
		cout<<"One negative number entered\n";
		if(i<0){
			break;
		}
			cout<<"Second negative number entered, program stop\n";
 
 
	}
	return 0;
}

top of loop
    enter variable x1
    enter variable x2
    are x1 and x2 the same and negative
    yes, then exit the loop
    multiply x1 * x2
end of loop