Dynamic Arrays

I have created a program allows you to input the amount of items purchased, and then input the price of each item and the sales tax. It then creates a receipt which totals all the prices and sales tax.

Now I want to be able to list the items and their prices in the sales receipt as well. What would I have to do so lets say you pick 5 items and type in 5 prices and it give you the sales receipt, before it tells you the total, I want it to list the 5 items so looks like this:

Sales Receipt

Item 1: Price
Item 2: Price
Item 3: Price
Item 4: Price
Item 5: Price

**********

(rest of sales receipt)

Here is what I have so far:

Code:

---

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
char rerun;

                do //The do-while for a program rerun option
                {

// Declare variables: counter, items, sales items, sales total, sales tax, and grand total
int items, count;
int * price;
double total, percent, g_t, tax;

// Input information
        cout<<"How many sales items do you have? :";
        cin>>items;

        price= new (nothrow) int[items];
        if (price == 0)
                cout << "error";
        else
        {
                        for (count = 0; count < items; count++)
                        {
                                cout<<"Enter the value of the sales item. : $";
                                cin>>price[count];
                                total = total + price;
                        }
        }
               
        cout << endl << endl;

        cout<<"Enter in the sales tax percentage. :";
        cin>>percent;
               
                tax = total * (percent/100);
                g_t = tax + total;
               
        cout << endl << endl;
               
        cout << "********************************************" << endl;
        cout << "********  S A L E S  R E C E I P T  ********" << endl;
        cout << "********************************************" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << "entered";
        for (count = 0; count < items; count++)
                cout << price[count] << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << setiosflags(ios::fixed) << setprecision(2);
        cout << "**  Total Sales:    $" << setw(9) << total << "            **" << endl;
        cout << "**  Sales Tax:      $" << setw(9) << tax << "            **" << endl;
        cout << "**                  -----------          **" << endl;
        cout << "**  Grand Total:    $" << setw(9) << g_t << "            **" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << "********************************************" << endl;
               
        cout << endl << endl;

                cout<<"Do you want to run this program again? (y/n)";
                cin>>rerun;
                       
                }

        while (rerun == 'y' || rerun == 'Y');
       
        system ("PAUSE");
        return 0;
} //End Main Function

---

I receive the following error:

Quote:

---

salerec.cpp(33) : error C2111: pointer addition requires integral operand
Error executing cl.exe.

salerec.exe - 1 error(s), 0 warning(s)

---

How should I be writing it so that an operator is used on a pointer?

Edit: Sorry, misread the code.

You need to change this:

Code:

---

total = total + price;

---

To:

Code:

---

total = total + price[count];

// or

total += price[count];

---

Then it should compile.

Code:

---

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
char rerun;

                do //The do-while for a program rerun option
                {

// Declare variables: counter, items, sales items, sales total, sales tax, and grand total
int items, count;
int * price;
double total, percent, g_t, tax;

// Input information
        cout<<"How many sales items do you have? :";
        cin>>items;

        price= new (nothrow) int[items];
        if (price == 0)
                cout << "error";
        else
        {
                        for (count = 0; count < items; count++)
                        {
                                cout<<"Enter the value of the sales item. : $";
                                cin>>price[count];
                                total = total + price[count];
                        }
        }
               
        cout << endl << endl;

        cout<<"Enter in the sales tax percentage. :";
        cin>>percent;
               
                tax = total * (percent/100);
                g_t = tax + total;
               
        cout << endl << endl;
               
        cout << "********************************************" << endl;
        cout << "********  S A L E S  R E C E I P T  ********" << endl;
        cout << "********************************************" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        for (count = 0; count < items; count++)
                cout << price[count] << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << setiosflags(ios::fixed) << setprecision(2);
        cout << "**  Total Sales:    $" << setw(9) << total << "            **" << endl;
        cout << "**  Sales Tax:      $" << setw(9) << tax << "            **" << endl;
        cout << "**                  -----------          **" << endl;
        cout << "**  Grand Total:    $" << setw(9) << g_t << "            **" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << "********************************************" << endl;
               
        cout << endl << endl;

                cout<<"Do you want to run this program again? (y/n)";
                cin>>rerun;
                       
                }

        while (rerun == 'y' || rerun == 'Y');
       
        system ("PAUSE");
        return 0;
} //End Main Function

---

Fixed it. The prices are now being displayed except it screwed up everything else in the display.

http://i44.servimg.com/u/f44/16/74/15/46/output10.jpg

It should be like this:
http://i44.servimg.com/u/f44/16/74/15/46/output11.jpg

You aren't initializing total before you start adding to it.


Quzah.

Quote:

---

Originally Posted by quzah

You aren't initializing total before you start adding to it.


Quzah.

---

How would I go about doing that?

You need to initialise the variable total to 0 before you use it for the sum of the prices entered by the user, otherwise it could contain any value and give you an incorrect output.

Edit:

Quote:

---

Originally Posted by xenhancd

How would I go about doing that?

---

Code:

---

total = 0;

---

Before you start using it.

Quote:

---

Originally Posted by Ushakal

You need to initialise the variable total to 0 before you use it for the sum of the prices entered by the user, otherwise it could contain any value and give you an incorrect output.

Edit:

Code:

---

total = 0;

---

Before you start using it.

---

DUH! Not sure why I changed that from the get go, I originally had total = 0.

However, I still cannot get the sales receipt portion to look the way I need to. It seems I cannot simply just add a cout and sales items there. How would I get it so that it automatically lists the number of items with the price. right now only the price is being listed.

Code:

---

cout << "Item # << itemnumber << ", quantity: " << howmany << endl;

---

Something like that. You just need to add a section there to actually display what you want to display.


Quzah.

I do have that in my code and it displays correctly, however, I want to number my items. I want it to ask "Input sales item 1" "Input sales item 2" "Input sales item 3" and then on the receipt I want it to do the same thing:

Sale item 1: $(price)
Sale item 2: $(price)
Sale item 3: $(price)

I want those number to show up. I can't find any tutorials or anything to read that teaches how to number items either.

Here is my current code:

Code:

---

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
char rerun;

                do //The do-while for a program rerun option
                {

// Declare variables: counter, items, sales items, sales total, sales tax, and grand total
int items, count;
int * price;
double total = 0, percent, g_t, tax;

// Input information
        cout<<"How many sales items do you have? :";
        cin>>items;

        price= new (nothrow) int[items];
        if (price == 0)
                cout << "error";
        else
        {
                        for (count = 0; count < items; count++)
                        {
                                cout<<"Enter the value of the sales item: $";
                                cin>>price[count];
                                total = total + price[count];
                        }
        }
               
        cout << endl << endl;

        cout<<"Enter in the sales tax percentage: ";
        cin>>percent;
               
                tax = total * (percent/100);
                g_t = tax + total;
               
        cout << endl << endl;

        cout << "********************************************" << endl;
        cout << "********  S A L E S  R E C E I P T  ********" << endl;
        cout << "********************************************" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        for (count = 0; count < items; count++)
                cout << "**  Sales Item #:    $" << setw(9) << setprecision(2) << price[count] << "          **" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << "********************************************" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << setiosflags(ios::fixed) << setprecision(2);
        cout << "**  Total Sales:    $" << setw(9) << total << "            **" << endl;
        cout << "**  Sales Tax:      $" << setw(9) << tax << "            **" << endl;
        cout << "**                  -----------          **" << endl;
        cout << "**  Grand Total:    $" << setw(9) << g_t << "            **" << endl;
        cout << "**                                        **" << endl;
        cout << "**                                        **" << endl;
        cout << "********************************************" << endl;
               
        cout << endl << endl;

                cout<<"Do you want to run this program again? (y/n)";
                cin>>rerun;
                       
                }

        while (rerun == 'y' || rerun == 'Y');
       
        system ("PAUSE");
        return 0;
} //End Main Function

---

Look, you are not going to find a specific tutorial for every possible programming scenario you are going to come across. This is where you need to apply what you learn to solve problems. Your questions are verging on ridiculous. Now apply this to the rest of your problem:

Code:

---

#include <iostream>

int main(){

        int itemNumber = 1;

        for(int i = 0; i < 5; i++){
                std::cout<<"Enter item number "<<itemNumber<<":"<<std::endl;
                itemNumber++;
        }

        std::cin.get();
        return (0);
}

---

Code:

---

cout << "**  Sales Item " << count + 1 << ":  $" << setw(9) << setprecision(2) << price[count] << "            **" << endl;

---

Ended up doing it that way and it works like a charm!

I found one big issue! I cannot input decimal value for the price of an item. I know this is because price is set to integer. I need to be able to use decimal values for the price. Previously I used double for price originally but to create the dynamic array, I changed it to integer.

What options are there? Or what can I do? The entire program just stops working as soon as I input decimals into the sales item price such 10.50.

Simply change your price array to an array of floats or doubles, e.g. double *price; and price = new (nothrow) double[items];

By the way, why do you use no-throw new[]? Actually, why do you directly use new[] when you can use a std::vector<int>?

Quote:

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Originally Posted by laserlight

By the way, why do you use no-throw new[]? Actually, why do you directly use new[] when you can use a std::vector<int>?

---

I'm sure that is what they are learning in whatever class the OP is taking. From what I've seen on this board many of the textbooks in use are creating many C+ programmers in order to still teach some basic comp sci stuff, such as arrays and memory management.

But the OP has not mentioned such a thing, thus we are in the dark, hence the necessary question.
Also important, you have a memory leak because you use new and not delete.

Quote:

---

Originally Posted by Elysia

But the OP has not mentioned such a thing, thus we are in the dark, hence the necessary question.

---

I wasn't questioning the necessity of the question, just guessing at most likely what the answer was going to be based on trends I have seen.

But again, guessing is pointless. We would probably all guess the same thing, but the point is that we don't know.
If the OP is required to use those things, then there is not much we can do. If not, then we should steer the OP onto the correct path.
We are trying to inquire whether we need to do that or not, so taking a wild guess here just won't cut it.

I am doing this for a class and the book that is assigned to help us actually really sucks. I've found reading stuff online and through forums helps to learn a lot more efficiently. I am a complete beginner to all of C++ and hence why some of my code rudimentary and basic.

On the bright side, I am learning a lot even though I am being difficult by asking so much. Thank you for baring with me.

Quote:

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Originally Posted by AndrewHunter

Simply change your price array to an array of floats or doubles, e.g. double *price; and price = new (nothrow) double[items];

---

I need to learn to completely follow through on my code when making edit. I had changed in the variable but failed to recognize to change it to double[items].

auto * price = new double[items];