void convertToPounds(double kilograms, double grams, 
                     double& pounds, double& ounces)
{
     double total_weight_kilograms, total_weight_pounds;

     // converts the entire weight entered by user to just kilograms
     total_weight_kilograms = kilograms + (grams / gramsPerKilogram);

     // converts the entire weight to pounds
     total_weight_pounds = total_weight_kilograms * poundsPerKilogram;

     // removes fractional part of pounds (floor in cmath library)
     pounds = floor(total_weight_pounds);

     // converts the leftover fractional part to ounces
     ounces = (total_weight_pounds - pounds) * ouncesPerPound;
}