test.cpp

#include <iostream>

using namespace std;
int main()
{
	int mass = 1;
	float weight;

	while (true)
	{
		cout << "Enter your objects mass (in kg). A Neg num stops program";
		cin >> mass;
		weight = mass * 9.8;
		if (mass <= 0)
		{
			return 0;
		}
		else 
		{
			if (weight >= 1000) 
			{
				cout << "Your object is too heavy!\n";
			}
			else (weight < 10)
			{
				cout << "Your object is too light!\n";
			}
		}
	}
	return 0;
}