#include <iostream>
#include <iomanip> // std::setprecision
using namespace std;

// Function Declarations
void readInputData(int& spoolsOrdered, int& spoolsInStock, double& shippingCharges);
void display(int spoolsOrdered, int spoolsInStock, double shippingCharges);
int main()
{
// Declaring variables
int spoolsOrdered, spoolsInStock;
double shippingCharges;

// Calling the functions
readInputData(spoolsOrdered, spoolsInStock, shippingCharges);
display(spoolsOrdered, spoolsInStock, shippingCharges);

return 0;
}

// This function will read the inputs entered by the user
void readInputData(int& spoolsOrdered, int& spoolsInStock, double& shippingCharges)
{

/* This while loop continues to execute
* until the user enters a valid number
*/
while (true)
{
cout << "Spools to be ordered :";
cin >> spoolsOrdered;
if (spoolsOrdered < 1)
{
cout << "** Spools Order must be 1 or more **" << endl;
continue;
}
else
break;
}

/* This while loop continues to execute
* until the user enters a valid number
*/
while (true)
{
cout << "Spools in Stock :";
cin >> spoolsInStock;
if (spoolsInStock < 1)
{
cout << "** Spools in stock must be 0 or more **" << endl;
continue;
}
else
break;
}


char ch;

cout << "Special shipping and handling (y or n):";
cin >> ch;

if (ch == 'y')
{
/* This while loop continues to execute
* until the user enters a valid number
*/
while (true)
{
cout << "Enter Special Shipping charges :";
cin >> shippingCharges;
if (shippingCharges < 0)
{
cout << "** The spool shipping and handling charge must be 0.0 or more **" << endl;
continue;
}
else
break;
}
}
else
{
shippingCharges = 11.88;
}
}

// This function will display the output
void display(int spoolsOrdered, int spoolsInStock, double shippingCharges)
{
// Setting the precision to two decimal places
std::cout << std::setprecision(2) << std::fixed;

cout << "Spools ready to ship :" << spoolsInStock << endl;
cout << "Spools on back-order :" << spoolsOrdered - spoolsInStock << endl;
double subtotal = spoolsInStock * 100;
cout << "Subtotal ready to ship: $" << setw(10) << subtotal << endl;
cout << "Shipping and handling :$" << setw(10) << spoolsInStock * shippingCharges << endl;
double total = (spoolsInStock * 100) + (spoolsInStock * shippingCharges);
cout << "Total shipping charges :$" << setw(10) << total << endl;
}

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