Question

I wrote this code and just realized I need to put it into at least 6 different functions and I don't know how. No specific ones but recommended is: Read Data, Calculate Installation Price, Calculate Subtotal, Calculate Total, Print -> 1) Print Measurements & 2) Print Charges. Can somebody help?

#include <stdio.h>

// Function Declarations

int length, width, area, discount;

int main ()
{
// Local Declarations
double price, cost, charge, laborCharge, installed, amtDiscount, subtotal, amtTax, total;
const double tax = 8.5;
const double labor = .35;

printf("Enter length in feet: ");
scanf("%d", &length);
printf("Enter width in feet: ");
scanf("%d", &width);
printf("Enter the percentage discount: ");
scanf("%d", &discount);
printf("Enter carpet price per foot: ");
scanf("%lf", &price);

area = length * width;
charge = price * area;
laborCharge = labor * area;
installed = charge + laborCharge;
amtDiscount = installed * (discount / 100.);
subtotal = installed - amtDiscount;
amtTax = tax / 100. * subtotal;
total = subtotal + amtTax;

printf("\n\t\tMEASUREMENT\n\n");
printf("Length \t%4d feet\n", length);
printf("Width \t%4d feet\n", width);
printf("Area \t%4d sq. ft\n", area);

printf("\n\t\tCHARGES\n\n");
printf("DESCRIPTION COST/SQ.FT. CHARGE/ROOM\n");
printf("----------- ----------- -----------\n");

printf("Carpet %5.2f $%7.2f\n", price, charge);
printf("Labor %.2f $%7.2f\n", labor, laborCharge);
printf("\t\t\t-----------\n");

printf("INSTALLED PRICE \t$%7.2f\n", installed);
printf("Discount %2d%% \t\t$%7.2f\n", discount, amtDiscount);
printf("\t\t\t-----------\n");

printf("SUBTOTAL \t\t$%7.2f\n", subtotal);
printf("Tax \t\t\t$%7.2f\n", amtTax);
printf("TOTAL \t\t\t$%7.2f\n", total);
return 0;
}

Answer 1

#include <stdio.h>

double GetArea(double length, double width)
{
return length * width;
}

double GetCharge(double price, double area)
{
return price * area;
}

double GetLaborCharge(double labor, double area)
{
return labor * area;
}

double GetInstalled(double charge, double laborCharge)
{
return charge + laborCharge;
}

double GetDiscountAmount(double installed, double discount)
{
return installed * (discount / 100.0);
}

double GetSubtotal(double installed, double discountAmount)
{
return installed - discountAmount;
}

double GetTaxAmount(double tax, double subtotal)
{
return tax / 100.0 * subtotal;
}

double ReadData()
{
double data;
scanf("%lf", &data);
return data;
}

void PrintMeasurment(double length, double width, double area)
{
printf("\n\tMEASUREMENT\n\n");
printf("Length \t\t%4d feet\n", (int)length);
printf("Width \t\t%4d feet\n", (int)width);
printf("Area \t\t%3.2lf sq. ft\n", area);
}

void PrintCharges(double price, double charge, double labor, double laborCharge)
{
printf("\n\tCHARGES\n\n");
printf("DESCRIPTION COST/SQ.FT. CHARGE/ROOM\n");
printf("----------- ----------- -----------\n");
printf("Carpet       %5.2f        $%7.2f\n", price, charge);
printf("Labor         %.2f        $%7.2f\n", labor, laborCharge);
printf("\n");
}

double CalculateInstallationPrice(double area, double price, double labor)
{
return GetInstalled(GetCharge(price, area), GetLaborCharge(labor, area));
}

double CalculateDiscount(double area, double price, double labor, double discount)
{
return GetDiscountAmount(CalculateInstallationPrice(area, price, labor), discount);
}

int main ()
{
int length, width, discount;
double price;
double area, charge, laborCharge;
double installed, amtDiscount, subtotal, amtTax, total;
const double tax = 8.5;
const double labor = .35;

printf("Enter length in feet: ");
length = (int)ReadData();
printf("Enter width in feet: ");
width = (int)ReadData();
printf("Enter the percentage discount: ");
discount = (int)ReadData();
printf("Enter carpet price per foot: ");
price = ReadData();

area = GetArea(length, width);
charge = GetCharge(price, area);
laborCharge = GetLaborCharge(labor, area);

PrintMeasurment(length, width, area);
PrintCharges(price, charge, labor, laborCharge);

installed = CalculateInstallationPrice(area, price, labor);
amtDiscount = CalculateDiscount(area, price, labor, discount);
subtotal = GetSubtotal(installed, amtDiscount);
amtTax = GetTaxAmount(tax, subtotal);
total = subtotal + amtTax;

printf("\t\t\t-----------\n");
printf("INSTALLED PRICE \t$%7.2f\n", installed);
printf("Discount %2d%% \t\t$%7.2f\n", discount, amtDiscount);
printf("\t\t\t-----------\n");

printf("SUBTOTAL \t\t$%7.2f\n", subtotal);
printf("Tax \t\t\t$%7.2f\n", amtTax);
printf("TOTAL \t\t\t$%7.2f\n", total);
return 0;
}

/*
output:-

Enter length in feet: 12
Enter width in feet: 78
Enter the percentage discount: 34
Enter carpet price per foot: 75

        MEASUREMENT

Length            12 feet
Width             78 feet
Area            936.00 sq. ft

        CHARGES

DESCRIPTION COST/SQ.FT. CHARGE/ROOM
----------- ----------- -----------
Carpet       75.00        $70200.00
Labor         0.35        $ 327.60

                        -----------
INSTALLED PRICE         $70527.60
Discount 34%            $23979.38
                        -----------
SUBTOTAL                $46548.22
Tax                     $3956.60
TOTAL                   $50504.81

*/