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#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
double getSaleAmount();
void calculateTax(double taxes[], const double saleAmount, int taxType);
double computeTaxDue(const double taxRate, const double saleAmount, double &discount);
double computeDiscount(const double grossTax);
void drawTable(double city[], double state[], double county[]);
void drawLine(const char symbol, const unsigned int width);
const double taxRates[3] = { .04, .03, .015 };
const unsigned int width = 35;
const char symbol = '-';
int main()
{
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2);
const double saleAmount = getSaleAmount();
double state[3];
double city[3];
double county[3];
calculateTax(state, saleAmount,0);
calculateTax(city, saleAmount,1);
calculateTax(county, saleAmount,2);
drawTable(city, state, county);
return 0;
}
//----------------------------------------------------------------------------
void drawTable(double city[], double state[], double county[])
{
cout << "\n\n";
drawLine('-', 65);
cout << "\n\tGross Tax\tDiscount\tTax Due\n";
drawLine('-', 65);
cout << "\nState\t";
for (int i = 0; i < 3; i++)
{
cout << "$" << state[i] << "\t\t";
}
cout << endl;
drawLine('-', 65);
cout << "\nCity\t";
for (int i = 0; i < 3; i++)
{
cout << left << "$" << city[i] << right << "\t\t";
}
cout << endl;
drawLine('-', 65);
cout << "\nCounty\t";
for (int i = 0; i < 3; i++)
{
cout << left << "$" << county[i] << right << "\t\t";
}
cout << endl;
drawLine('-', 65);
cout << "\n\t\t\t\t\t Total:\t" << "$" << county[2] + state[2] + city[2];
cout << endl;
}
//----------------------------------------------------------------------------
void calculateTax(double taxes[], const double saleAmount, int taxType)
{
taxes[2] = computeTaxDue(taxRates[taxType], saleAmount, taxes[1]);
taxes[0] = taxes[2]+taxes[1];
}
//----------------------------------------------------------------------------
double getSaleAmount()
{
double saleAmount = 0.00;
do
{
cout << endl;
cout << "Please enter the sale amount before tax. " << "$";
cin >> saleAmount;
if (saleAmount <= 0)
{
cout << endl;
cout << "Sorry! You have entered an invalid sale amount. " << endl;
cout << "Please try again." << endl;
cout << endl;
}
} while (saleAmount <= 0);
return saleAmount;
}
//----------------------------------------------------------------------------
double computeTaxDue(const double taxRate, const double saleAmount, double &discount)
{
double taxAmount = taxRate*saleAmount;
double grossTax = taxAmount;
discount = computeDiscount(grossTax);
return taxAmount - discount;
}
//----------------------------------------------------------------------------
double computeDiscount(const double grossTax)
{
double discount;
if (grossTax <= 100)
{
discount = grossTax*.05;
}
else if (grossTax > 100)
{
discount = (grossTax - 100)*.025 + 5;
}
return discount;
}
//----------------------------------------------------------------------------
void drawLine(const char symbol, const unsigned int width)
{
for (unsigned int x = 0; x < width; x++)
{
cout << symbol;
}
}
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