Uguly Carpet

main.cpp

/*
 
 Write a C++ program that creates a customer bill for a carpet company. The following information is input:
 
 The length of width of the carpet in feet.
 
 The carpet price per square foot
 
 The percent of discount for the customer
 
 
 
 The labor cost is fixed at $ 0.35 per square foot. The tax rate is 8.5%. Both of these constants are to be set as globally preprocessor constants.
 
 
 
 All input is to be done in a separate function called input().
 All calculations are performed in a function that calls three subfunctions as follows:
 A subfunction calcInstall() to calculate carpet cost, labor cost, and installed cost (carpet cost plus labor cost).
 A subfunction calcSubtotal() to calculate the amoun of the discount and the subtotal
 A subfunction calcTotal() to calculate the amount of tax and the total of the order.
 All output is to be done in a separate function called output()
 Test data: Length = 20; Width = 10; Rate of discount = 5%; Cost per sq ft = $30.00.
 
 Programmers: 
    1) Spencer Do
    2) Yongjun YU
 
 */

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

#define _DEBUG false
#define TAX_RATE 0.085f
#define LABOR_RATE 0.35f

//Function Prototypes
void inputData(int& l, int& w, int& dis, double& unitCost);

int calc(int l,int w, int d, double unitC, int area, double& carpetCost,
         double& labour, double& install, double& discount, double& taxes, double& subtotal, double& total);

void output(int l, int w, int dis, double unitCost, int area, double carpetCost,
            double labour, double install, double discount, double taxes, double subtotal, double total);

int calcInstall(int area, double unitC, double& carpet, double& labor);
void calcSubtotal(double installCost, int discountRate, double& discount, double& subtotal);
void calcTotal(const double subtotal, double& tax, double& total);

int main()

{
    //declare variables
    
    int length, width, discountRate, area;
    double priceSqFt, carpetCost, labour, install, discount;
    double subtotal, taxes, total;
    
    // input dimensions of room, discount and price per sq ft of carpet
    inputData(length, width, discountRate, priceSqFt);
    
    // compute cost
    area = calc(length, width, discountRate, priceSqFt, area, carpetCost,
     labour, install, discount, taxes, subtotal, total);
    
    //output
    output(length, width, discountRate, priceSqFt, area, carpetCost,
           labour, install, discount, taxes, subtotal, total);
    system("pause");
    return 0;
    
}
/*====================input==============================
 Purpose: Inputs the room dimensions, percent of discount, and
 the cost of the carpet per square foot. */

void inputData(int& l, int& w, int& dis, double& unitCost) {
#if _DEBUG
    l = 20;
    w = 10;
    dis = 5;
    unitCost = 30;
#else
    /*
     
     Pre: Addresses for room dimensions, rate of discount, price per square foot of carpet
     Post: Nothin
     */
    cout << "please enter the length of room: ";
    cin >> l;
    
    cout << "please enter the width of room: ";
    cin >> w;
    
    cout << "please enter the discount rate: ";
    cin >> dis;
    
    cout << "please enter the cost per square feet of carpet: ";
    cin >> unitCost;
#endif
    return;
}

/* ===================== calculations====================================
 Purpose: Computes the costs for labor and carpet. Computes discount, subtotal, taxes and total.
 
 Pre: length, width, discount rate, and unit price along with references to cost of carpet,
 cost of labour, installation cost, amount of discount, tax, subtotal and total for order.
 Post: The area of the room is returned.*/

 int calc(int l,int w, int d, double unitC, int area, double& carpetCost,
 double& labour, double& install, double& discount, double& taxes, double& subtotal, double& total) {
     area = l * w;
     install = calcInstall(area, unitC, carpetCost, labour);
     calcSubtotal(install, d, discount, subtotal);
     calcTotal(subtotal, taxes, total);
     return area;
 }

/* =====================calcInstall=================================
 Purpose: Computes costs of labor and carpet and their sum.
 Pre: area and unit price along with the references to carpet cost, labor cost, and
 installed cost.
 Post: returns install cost*/
int calcInstall(int area, double unitC, double& carpet, double& labor) {
    carpet = unitC * area;
    labor = LABOR_RATE * area;
    return carpet + labor;
}

/* =======================calcSubtotal===============================
 Purpose: Computes the amount of discount and subtotal.
 
 Pre: The installed cost and discount rate along with addresses for the
 amount of the discount and the subtotal.
 Post: Nothing*/
void calcSubtotal(double installCost, int discountRate, double& discount, double& subtotal) {
    discount = installCost * static_cast<double>(discountRate) / 100;
    subtotal = installCost - discount;
}

/*========================calcTotal=================================
 Computes the tax and total.
 
 Pre: Subtotal along with reference pointers to tax and total
 Post: Nothing */
void calcTotal(const double subtotal, double& tax, double& total) {
    tax = subtotal * TAX_RATE;
    total = tax + subtotal;
}

void output(int l, int w, int dis, double unitCost, int area, double carpetCost,
            double labor, double install, double discount, double taxes, double subtotal, double total) {
    cout << setprecision(2) << fixed;
    cout<< "\t\t\tMEASUREMENT" << endl;
    cout<<"Length: " << setw(3) << l <<" ft" << endl;
    cout<<"Width:  " << setw(3) << w <<" ft" << endl;
    cout<<"Area:   " << setw(3) << area <<" ft" << endl;
    
    cout<<"\n\n\t\t\tCHARGES" <<endl;
    cout<<"\nDESCRIPTION COST/SQ.FT. CHARGE" <<endl;
    cout<<"----------- ----------- ----------";
    cout<<left << setw(17) << "\nCarpet " << right << setw(7) << unitCost << " " << setw(10) << carpetCost;
    cout<<left << setw(17) <<"\nLabor " << right << setw(7) << LABOR_RATE<< " " << setw(10) << labor;
    cout<< setw(25) <<"\n-----------";
    cout<<left << setw(20) <<"\nINSTALLED PRICE $ " << right << setw(15) << install;
    cout<<left << setw(20) <<"\nDiscount          " << right << setw(7)<< dis << "%" <<setw(7) << discount;
    cout << setw(25) <<"\n-----------";
    cout<<left << setw(28) <<"\nSUBTOTAL $        " << right << setw(7) << subtotal;
    cout<<left << setw(28) <<"\nTax               " << right << setw(7) << taxes;
    cout<<left << setw(28) <<"\nTOTAL $           " << right << setw(7) << total;cout<< endl;
    
    cout << endl << endl << "Programmed by: 1) Spencer Do" << endl;
    cout << right << setw(28) << "2) Yongjun YU" << endl << endl;
}
/*
 please enter the length of room: 20
 please enter the width of room: 10
 please enter the discount rate: 5
 please enter the cost per square feet of carpet: 30
 MEASUREMENT
 Length:  20 ft
 Width:   10 ft
 Area:   200 ft
 
 
 CHARGES
 
 DESCRIPTION COST/SQ.FT. CHARGE
 ----------- ----------- ----------
 Carpet            30.00    6000.00
 Labor              0.35      70.00
 -----------
 INSTALLED PRICE $          6070.00
 Discount                 5% 303.50
 -----------
 SUBTOTAL $                 5766.50
 Tax                         490.15
 TOTAL $                    6256.65
 
 
 Programmed by: 1) Spencer Do
 2) Yongjun YU
 
 */