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#include <iostream>
#include <cmath>
using namespace std;
void calculateState(double state[], const double saleAmount);
void calculateCounty(double county[], const double saleAmount);
void calculateCity(double city[], const double saleAmount);
double getSaleAmount();
double computeTaxDue(const double taxRate, const double saleAmount, double &discount);
double computeDiscount(const double saleAmount, double discount, double taxAmount);
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];
calculateState(state, saleAmount);
calculateCity(city, saleAmount);
calculateCounty(county, saleAmount);
drawTable(city, state, county);
return 0;
}
//----------------------------------------------------------------------------
void drawTable(double city[], double state[], double county[])
{
cout << "\n\n";
drawLine('-', 50);
cout << "\n\tGross Tax\tDiscount\tTax Due\n";
drawLine('-', 50);
cout << "\nState\t";
for (int i = 0; i < 3; i++)
{
cout << "$" << state[i] << "\t\t";
}
cout << endl;
drawLine('-', 50);
cout << "\nCity\t";
for (int i = 0; i < 3; i++)
{
cout << "$" << city[i] << "\t\t";
}
cout << endl;
drawLine('-', 50);
cout << "\nCounty\t";
for (int i = 0; i < 3; i++)
{
cout << "$" << county[i] << "\t\t";
}
cout << endl;
drawLine('-', 50);
cout << "\n\t\t\t\t Total:\t" << "$" << county[2] + state[2] + city[2];
cout << endl;
}
//----------------------------------------------------------------------------
void calculateState(double state[], const double saleAmount)
{
state[0] = taxRates[0] * saleAmount;
state[1] = computeDiscount(saleAmount, 0, state[0]);
state[2] = (state[0]) - (state[1]);
}
//----------------------------------------------------------------------------
void calculateCity(double city[], const double saleAmount)
{
city[0] = taxRates[1] * saleAmount;
city[1] = computeDiscount(saleAmount, 0, city[0]);
city[2] = (city[0]) - (city[1]);
}
//----------------------------------------------------------------------------
void calculateCounty(double county[], const double saleAmount)
{
county[0] = taxRates[2] * saleAmount;
county[1] = computeDiscount(saleAmount, 0, county[0]);
county[2] = (county[0]) - (county[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;
discount = computeDiscount(saleAmount, discount, taxAmount);
return taxAmount - discount;
}
//----------------------------------------------------------------------------
double computeDiscount(const double saleAmount, double discount, double taxAmount)// double computeDiscount(double grossTax)
{
if (taxAmount <= 100)
{
discount = taxAmount*.05;
}
else if (taxAmount > 100)
{
discount = (taxAmount - 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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