How to resolve "illegal,left operand has type 'double" error?

[Terry Archer]

error C2296: '%' : illegal,left operand has type 'double'

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;

const int OUNCES_PER_POUND = 16; 
const double POUNDS_PER_KILOGRAM = 2.2;

int main()
{
    int Pounds;
	int Ounces;
	double Kilograms;
    double totalPounds;
    double totalOunces;

	ifstream fin;
	ofstream fout;

	fin.open("inData.txt");
    fout.open("outData.txt");

	fin >> Kilograms;

	totalPounds = static_cast<double>(Kilograms * POUNDS_PER_KILOGRAM);
    totalOunces = static_cast<double>(Pounds * OUNCES_PER_POUND);
    Pounds = static_cast<int>(totalOunces / OUNCES_PER_POUND + 0.5);
	Ounces = static_cast<int>(totalPounds % OUNCES_PER_POUND);
		
	fout << Pounds << "\nPounds";
	fout << Ounces << "\nOunces";
	fin.close();
	fout.close();

return 0;
}

[tdlr]

You cannot use % with double. Change totalPounds to an integer type like long.