How to put a counter..

[cppbeginner3]

So for this code I have a menu and I need to put counters for Falafel, Soda, and extras with their totals set to two decimal places. I already have a total and sub total for the order but not for individual items. please help.

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


int main(int argc, char* argv[])
{
	double total = 0.00;
	double sub_total = 0.00;
    double tax = 0.00;
    double price;
	char selection;
  
    
	
	cout << "F = falafel 5.15" << endl;
	cout << "S = soda 2.24" << endl;
	cout << "X = extras 1.57" << endl;
	cout << "T = total" << endl;
    
	do
	{
		price = 0;
		cout << "Make your selection (HSF): ";
		cin  >> selection;
        
            
        
        
		switch (selection)
		{
            case 'F':
            case 'f':
                price = 5.15;
                break;
            case 'S':
            case 's':
                price = 2.24;
                break;
            case 'X':
            case 'x':
                price = 1.57;
                break;
            case 'T':
            case 't':
                break;
            default:
                cout << "Illegal selection, try again." << endl;
		}
		
        total += price + (price* .087);
        
        sub_total += price;
        
        tax += (price* .087);
        
       
        
        
   
        	} while (selection != 'T' && selection != 't');
    
    cout << setiosflags(ios::fixed) << setiosflags(ios::showpoint);
    cout << "The Subtotal is: $"<< setprecision(2) <<  sub_total << endl;
    
    cout << setiosflags(ios::fixed) << setiosflags(ios::showpoint);
    cout << "The Tax is: $"<< setprecision(2) <<  tax << endl;

    cout << setiosflags(ios::fixed) << setiosflags(ios::showpoint);
    cout << "The Total is: $"<< setprecision(2) <<  total << endl;
    
    

  
    
  
    


    
    
   	return 0;
}