Not sure how to add a running total

[vasncode]

I need to add a running total to this, that adds the users price in case they want more pizza, but im not sure where to put it. (fairly new to this)

Here's the code:

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


void displayPizzaMenu();

void displaySizeMenu();

int getPizzaChoice();

int getSizeChoice();

void totalprice (int, double);



int main()
{


const double personal = 10.00,  /// aka num 2  
             medium = 14.50,
            large = 19.00,
            extralarge = 23.50;

const int MEAT_CHOICE = 1,
        VEGGIE_CHOICE =2,
        HAWAII_CHOICE =3,
        PHILLY_CHOICE =4,
        BBQ_CHOICE = 5,
        EXIT_CHOICE = 6;

const int PERSONAL_SIZE = 1,
            MEDIUM_SIZE =2,
            LARGE_SIZE =3,
            EXTRA_LARGE =4;

int pizzaChoice; // holds menu choice
int sizechoice; // holds size 
int howMany; //how many they want aka   num 1
cout<< setprecision(2)<<fixed<<showpoint;


cout<<endl;
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<< " Welcome to Ian's Pizza of West Chester! \n";
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<<endl;




do{

displayPizzaMenu ();
getPizzaChoice ();

cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";

displaySizeMenu();
getSizeChoice();

sizechoice= getSizeChoice();
switch (sizechoice)
{
case 1:
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<<" How many personal pizzas?  ";
cin>>howMany;
cout<< "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<<endl;
cout<< fixed << showpoint << setprecision(2);
cout<< "Your order total is  $";
totalprice(howMany, personal);
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
break;


case 2:
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<<" How many medium pizzas?  ";
cin>> howMany;
cout<<endl;
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<< "Your total price is  $";
cout<< fixed << showpoint << setprecision (2);
totalprice(howMany, medium);
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
break;


case 3:
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<<" How many large pizzas?  ";
cin>>howMany;
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<< " Your order total is  $";
cout<< fixed << showpoint << setprecision (2);
totalprice(howMany, large);
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
break;

case 4:
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<<" How many extra large pizzas?  ";
cin>>howMany;
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<< "Your order total is $";
cout<< fixed << showpoint << setprecision (2);
totalprice(howMany, extralarge);
cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
break;

    }

} while (sizechoice <= 4);






return 0;

}





void displayPizzaMenu()
{
cout<<"Specialty Pizza Menu \n"
<< "1) Meat Lovers \n"
<< "2) Vegetartian \n"
<< "3) Hawaiian \n"
<< "4) Philly Steak \n"
<< "5) BBQ Chicken \n"
<< "6) Exit Menu \n";
}




void displaySizeMenu()
{
cout<<"Available Sizes and Prices \n"
<<endl
<< "1) 10 Personal       - $10.00 \n"
<< "2) 14 Medium         - $14.50\n"
<< "3) 16 Large          - $19.00\n"
<< "4) 18 Extra Large    - $23.50\n";

}
 



int getPizzaChoice()
{
  int pizzaChoice;
  cout<< "Your choice (1-6)?  ";
  cin>>pizzaChoice;

while (pizzaChoice < 1 || pizzaChoice > 6)
{
cout<< pizzaChoice << " is not a valid choice. Please enter 1-6. \n"; 
cout<< "your choice?   ";
cin>>pizzaChoice;
}
 if ( pizzaChoice == 6)
  {
cout<< " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
<<" Thank you for visiting Ian's Pizza of West Chester!  Come back Soon!\n"
<< "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
cout<<endl;
  exit(-1);
  }
   pizzaChoice++;
  return pizzaChoice;
}



int getSizeChoice()
{
 int sizechoice;
cout<<" Your Choice (1-4)?   ";
cin>>sizechoice;

if ((sizechoice > 4 ) || (sizechoice < 0))
{
cout<< " please enter a valid choice (1-4)\n";
cin>>sizechoice;
}
return sizechoice;
}

void totalprice (int num1, double num2)
{
cout<<(num1 * num2)<<endl;

}

[Ganado]

You will receive faster, better help if you format your source code to make it easier to read.
How to use code tags: http://www.cplusplus.com/articles/jEywvCM9/

There are other tags available.
How to use tags: http://www.cplusplus.com/articles/z13hAqkS/

Hint: You can edit your post and add code tags.

You call getSizeChoice(); but never use its value. sizechoice in main is uninitialized: undefined behavior.

[DizzyDon]

You must use "code tags" when posting code, like this:

[code]
Always put your code between code tags!
[/code]

As for your problem, sizechoice will not magically receive the value from getSizeChoice().
You need to say:

sizechoice = getSizeChoice();

[vasncode]

Okay I'll make sure to do that, thank you for you help.

[againtry]

Line 64 can be deleted

[vasncode]

thanks!

[againtry]

FWIW: This doesn't solve your immediate problem but shows how you can take advantage of re-organizing the data, simplifying and especially removing duplication.

Each one of the commented sections can be put into functions, leaving a while loop with appropriate exits in main.

All the fiddly stuff about presentation is a low priority.

#include <iostream>
#include <string>

int main()
{
    std::string pizza_type[]
    {"Meat Lovers","Vegetarian","Hawaiian","Philly Steak","BBQ Chicken"};
    
    std::string pizza_size[]
    {"Personal","Medium","Large","Extra Large"};
    
    double price_list[]{10.00,14.50,19.00,23.50};
    
    // SELECT TYPE
    for(int i = 0; i < 5; i++)
        std::cout << i << ' ' << pizza_type[i] << '\n';
    
    int type_no{0};
    std::cout << "Enter type: ";
    std::cin >> type_no;
    
    // SELECT SIZE
    for(int i = 0; i < 4; i++)
        std::cout << i << ' ' << pizza_size[i] << " $" << price_list[i] << '\n';
    
    int size_no{0};
    std::cout << "Enter type: ";
    std::cin >> size_no;
    
    // ENTER HOW MANY
    int how_many{0};
    std::cout << "Enter how many: ";
    std::cin >> how_many;
    
    // CALCULATE PRICE
    double price = price_list[size_no] * how_many;
    std::cout
    << how_many << ' ' << pizza_type[type_no] << " - "
    << pizza_size[size_no]
    << " @ $" << price_list[size_no] << " = $" << price << '\n';
    
    // CALCULATE GRAND TOTAL
    double grand_total{0};
    grand_total += price;
    std::cout << "TOTAL $" << grand_total << '\n';
    
    return 0;
}

0 Meat Lovers
1 Vegetarian
2 Hawaiian
3 Philly Steak
4 BBQ Chicken
Enter type: 1
0 Personal $10
1 Medium $14.5
2 Large $19
3 Extra Large $23.5
Enter type: 2
Enter how many: 3
3 Vegetarian - Large @ $19 = $57
TOTAL $57
Program ended with exit code: 0

[againtry]

One of the difficulties with the lack of a full problem description is whether individual purchases are to be saved, which is one way to produce an itemised list, or whether you just want a running total as orders are made. All this is possible but depends on how far down the learning track you are.

#include <iostream>
#include <string>

int main()
{
    std::string pizza_type[]
    {"Meat Lovers","Vegetarian","Hawaiian","Philly Steak","BBQ Chicken"};
    
    std::string pizza_size[]
    {"Personal","Medium","Large","Extra Large"};
    
    double price_list[]{10.00,14.50,19.00,23.50};
    
    double grand_total{0};
    char ch{'*'};
    
    while(std::cout << "c to continue q to quit " and std::cin >> ch and ch != 'q')
    {
        // SELECT TYPE
        for(int i = 0; i < 5; i++)
            std::cout << i << ' ' << pizza_type[i] << '\n';
        
        int type_no{0};
        std::cout << "Enter type: ";
        std::cin >> type_no;
        
        // SELECT SIZE
        for(int i = 0; i < 4; i++)
            std::cout << i << ' ' << pizza_size[i] << " $" << price_list[i] << '\n';
        
        int size_no{0};
        std::cout << "Enter type: ";
        std::cin >> size_no;
        
        // ENTER HOW MANY
        int how_many{0};
        std::cout << "Enter how many: ";
        std::cin >> how_many;
        
        // CALCULATE PRICE
        double price = price_list[size_no] * how_many;
        std::cout
        << how_many << ' ' << pizza_type[type_no] << " - "
        << pizza_size[size_no]
        << " @ $" << price_list[size_no] << " = $" << price << '\n';
        
        // CALCULATE GRAND TOTAL
        grand_total += price;
    }
    
    std::cout << "TOTAL $" << grand_total << '\n';
    
    return 0;
}

c to continue q to quit c
0 Meat Lovers
1 Vegetarian
2 Hawaiian
3 Philly Steak
4 BBQ Chicken
Enter type: 3
0 Personal $10
1 Medium $14.5
2 Large $19
3 Extra Large $23.5
Enter type: 2
Enter how many: 2
2 Philly Steak - Large @ $19 = $38
c to continue q to quit c
0 Meat Lovers
1 Vegetarian
2 Hawaiian
3 Philly Steak
4 BBQ Chicken
Enter type: 2
0 Personal $10
1 Medium $14.5
2 Large $19
3 Extra Large $23.5
Enter type: 3
Enter how many: 3
3 Hawaiian - Extra Large @ $23.5 = $70.5
c to continue q to quit q
TOTAL $108.5
Program ended with exit code: 0

[seeplus]

[continued at http://www.cplusplus.com/forum/beginner/282969/ ]

[vasncode]

Thank you guys seriously ^^^