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

//global variables
double totalDistance;
double variableCosts;
double shippingCost;
double finalShippingCost;
double n1, n2, n3, n4, n5, n6, n7, n8;

int main()

{
	void validDistance();
	void calcVariableCosts();
	const char poundSign(156);

	cout << "Enter the distance in miles:";
	cin >> totalDistance;

	validDistance();

	calcVariableCosts();

	shippingCost + 50 == finalShippingCost;

	cout.setf(ios::fixed);
	cout << setprecision(2);
	cout << "The cost of the shipment over " << totalDistance << "miles is " << poundSign << finalShippingCost << "\n";


	system("pause");
	return (0);
}

void validDistance()
{
	if (totalDistance <= 0)
	{
		cout << "ERROR: The distance should be a positive value" << "\n";

	}
	else
	{
		(totalDistance > 0);

	}

}

void calcVariableCosts()
{
	if (totalDistance <= 100)
	{
		totalDistance * 5.5 == shippingCost;
	}
	else if (totalDistance > 100 && totalDistance <= 500)
	{
		totalDistance - 100 == n1;
		100 * 5.5 == n2;
		n1 * 4 == n3;
		n2 + n3 == shippingCost;
	}
	else if (totalDistance > 500)

	{
		totalDistance - 100 == n4;
		n4 - 400 == n5;
		100 * 5.5 == n6;
		400 * 4.0 == n7;
		n2 * 2.5 == n8;
		n6 + n7 + n8 == shippingCost;
	}
}