Error in Output : C++ Carpet Store - c++

Question

I am working on an assignment in C++ but i am relatively new to the C++ programming language, however, I am getting errors in my output.
Question
The manager of the Crosswell Carpet Store has asked you to write a program to print customers’ bills. The manager has given you the following information:
The length and width of a room are expressed in terms of meters and centimeters. For example, the length might be reported as 16.7 meters.
The store does not sell fractions of a meter. Thus, the length and width must always be rounded up.
The carpet charge is equal to the number of square meters purchased times the carpet cost per square meter. Sales tax equal to 14% of the carpet cost must be added to the bill.
The labour cost is equal to the number of square meters purchased times R24.00, which is the labor cost per square meter. No tax is charged on labour.
Each customer is identified by a five-digit number, and that number should appear on the bill. Large-volume customers, identified by a customer number starting with a '0', may be given a discount. The discount applies to the cost before sales tax is added.
The sample output follows:
CROSWELL CARPET STORE STATEMENT
Customer name : xxxxx
Customer number : xxxxx
Carpet price : xx.xx
Labour : xx.xx
Subtotal : xx.xx
Less discount : xx.xx
Subtotal : xx.xx
Plus tax : xx.xx
Total : xx.xx
And my answer to this question is as follows:
#include <iostream>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
using namespace std;
int calculateCarpetSize (int length, int width)
{
int carpetSize;
carpetSize = ceil(length * width);
return carpetSize;
}
float calculateCarpetCost (int carpetSize , float sellingPrice)
{
float carpetCost;
carpetCost = carpetSize * sellingPrice;
return carpetCost;
}
float calculateLabourCost(int carpetSize)
{
float labourCost;
labourCost = carpetSize * 24.00;
return labourCost;
}
bool qualifyForDiscount(string customerNo)
{
string dis = "0";
if (customerNo.compare(0, dis.length(), dis) == 0)
{
return true;
}
else{
return false;
}
}
float computeDiscount ()
{
int discountPercentage;
float discount;
cout << "Enter the Percetage Discount: ";
cin >> discountPercentage ;
discount = discountPercentage / 100;
return discount;
}
void printCustomerStatement(string customerName, string customerNo, float carpetCost, float labourCost, float discount)
{
float subtotal = carpetCost + labourCost - discount;
float vat = subtotal*0.14;
cout << "\n CROSWELL CARPET STORE"<<endl;
cout << " STATEMENT"<<endl;
cout << "Customer name : "<<customerName<<endl;
cout << "Customer number : "<<customerNo <<'\n'<<endl;
cout << "Carpet price : "<<carpetCost<<endl;
cout << "Labour : "<<labourCost <<'\n'<<endl;
cout << "Subtotal : "<<carpetCost+labourCost<<endl;
cout << "Less discount : "<<discount <<'\n'<<endl;
cout << "Subtotal : "<<subtotal<<endl;
cout << "Plus Tax : "<<vat<<endl;
cout << "Total : "<<subtotal - vat<<endl;
}
int main()
{
string customerName;
string customerNo;
float carpetSize;
float sellingPrice;
float length;
float width;
float carpetCost;
float labourCost;
float discount;
cout <<"ENTER CUSTOMER NAME:";
cin >>customerName;
cout <<"ENTER CUSTOMER NUMBER:";
cin >>customerNo;
cout <<"ENTER ROOM WIDTH:";
cin >>width;
cout <<"ENTER ROOM LENGTH:";
cin >>length;
cout <<"ENTER SELLING PRICE:";
cin >>sellingPrice;
calculateCarpetSize(length, width);
calculateCarpetCost(carpetSize, sellingPrice);
calculateLabourCost(carpetSize);
if(qualifyForDiscount(customerNo))
{
computeDiscount();
}else
{
discount = 0.00;
}
printCustomerStatement(customerName, customerNo, carpetCost, labourCost, discount);
return 0;
}
I think the problem may be my function or my datatypes, or perhaps both.
EDIT
I get an output of this sort
ENTER CUSTOMER NAME:Quatban
ENTER CUSTOMER NUMBER:02234
ENTER ROOM WIDTH:20
ENTER ROOM LENGTH:20
ENTER SELLING PRICE:35
ENTER DISCOUNT PERCENTAGE: 2
CROSWELL CARPET STORE
STATEMENT
Customer name : Quatban
Customer number : 02234
Carpet price : 1.4e+004
Labour : 9.6e+003
Subtotal : 2.4e+004
Less discount : 0
Subtotal : 2.4e+004
Plus Tax : 3.3e+003
Total : 2e+004

Answer 1

First
Thus, the length and width must always be rounded up
Which means your function calculateCarpetSize should look more like :
int calculateCarpetSize (float length, float width)
{
int carpetSize;
carpetSize = ceil(length) * ceil(width);
return carpetSize;
}
Then
In your main :
calculateCarpetSize(length, width);
calculateCarpetCost(carpetSize, sellingPrice);
calculateLabourCost(carpetSize);
You should be storing the result of these functions like :
carpetSize = calculateCarpetSize(length, width);
carpetCost = calculateCarpetCost(carpetSize, sellingPrice);
labourCost = calculateLabourCost(carpetSize);
Edit
This actually gives you as output :
ENTER CUSTOMER NAME:Quatban
ENTER CUSTOMER NUMBER:02234
ENTER ROOM WIDTH:20
ENTER ROOM LENGTH:20
ENTER SELLING PRICE:35
Enter the Percetage Discount: 2
CROSWELL CARPET STORE
STATEMENT
Customer name : Quatban
Customer number : 02234
Carpet price : 14000
Labour : 9600
Subtotal : 23600
Less discount : 0
Subtotal : 23600
Plus Tax : 3304
Total : 20296
This looks like your (expected ?) result, even if I believe the last line should be subtotal + tax and not subtotal - tax but I may be wrong.