Function that displays most profitable day of week

Sorry for posting entire code but would be much easier to help.

I am trying write a void function which will tally up the totals for each day and then display the most profitable day of the week.

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  #include "stdafx.h"
#include <iostream>
using namespace std;
#include <iomanip>
#include <string>
#include <fstream>  


struct Menu_Items
		{
			string Item;
			double Price;
		};

struct Orders
		{
			string Menu_Item_Ordered;
			string Day_of_Week;
			string CustomerID;
			int Quantity;
			double Line_Item_Total;

		};

const int NUM_MENU_ITEMS = 20;
const int ORDERS = 100;
const double PA_SALES_TAX = 1.06;

double GetPrice( Menu_Items [] , string );
void Biggest_Profit(Double[]);

int main()
{

	Menu_Items Menu_List[NUM_MENU_ITEMS];
	int i = 0;

	ifstream InFileMenu;
	InFileMenu.open("Menu.txt");
	ifstream InFileOrders;
	InFileOrders.open("Orders.txt");

	

	

	if ( InFileMenu.fail() )
	{
		cout << "The 'Menu.txt' file you have entered cannot be found!!!" << endl;
		system("pause");
	}
	else
	{
		cout << "The 'Menu.txt' file you have enetered was found!!" << endl;
		system("pause");


		string Item;
		double Price;

		while (InFileMenu >> Item >> Price)
		{
			cout << "The Menu item: #" << i + 1 << " is the " << Item << " and it cost: $" << Price << endl;
			Menu_List[i].Item = Item;
			Menu_List[i].Price = Price;
			i++;
		}


	}


	Orders Orders_Placed[ORDERS];
	int Orders_Index = 0;
	

	if (InFileOrders.fail())
	{
		cout << "The 'Orders.txt' file you have entered cannot be found!!!" << endl;
		system("pause");
	}
	else
	{
		cout << "The 'Orders.txt' file you have enetered was found!!" << endl << endl;
		system("pause");

		

		string Menu_Item_Ordered, Day_of_Week, Customer_ID;
		int Quantity, Max = 0, Num_of_Orders;
		double Line_Item_Total, Days_Profit;
		
		
		while ( InFileOrders >> Menu_Item_Ordered >> Quantity >> Day_of_Week >> Customer_ID )
		{
			
			cout << "Customer: " << Customer_ID << " ordered " << Quantity << " " << Menu_Item_Ordered << " on " << Day_of_Week << "." << endl << endl;

			Orders_Placed[Orders_Index].Menu_Item_Ordered = Menu_Item_Ordered;
			Orders_Placed[Orders_Index].Quantity = Quantity;
			Orders_Placed[Orders_Index].Day_of_Week = Day_of_Week;
			Orders_Placed[Orders_Index].CustomerID = Customer_ID;
			Orders_Index++;

			if (Orders_Index > Max)
			{
				Max = Orders_Index;
				Num_of_Orders = Orders_Index;
			}
			
		}
		cout << "There was a total of " << Num_of_Orders << " orders!!!" << endl;
		system("pause");

		
			
		 for (i = 0; i < Num_of_Orders; ++i)
		 {
			
			Line_Item_Total = Orders_Placed[i].Quantity * GetPrice(Menu_List, Orders_Placed[i].Menu_Item_Ordered) * PA_SALES_TAX;
			Orders_Placed[i].Line_Item_Total = Line_Item_Total;
			cout << "The line item total for " << Orders_Placed[i].Quantity << " " << Orders_Placed[i].Menu_Item_Ordered << " is: $" << setw(2) << fixed  << setprecision(2) << Orders_Placed[i].Line_Item_Total << endl;
		}
	}system("pause");

	
	
	 Biggest_Profit(Orders_Placed);
	 cout << Orders_Placed[i].Line_Item_Total << endl;
	 system("pause");

	
	







	return 0;
}

double GetPrice( Menu_Items Menu[], string  Item)
{
	int i = 0;
	for (i = 0; i < NUM_MENU_ITEMS; ++i)
	if (Menu[i].Item == Item)
		return Menu[i].Price;
	
}

void Biggest_Profit(double Orders_Total[])
{
	double MonTotals, TueTotals, WedTotals, ThuTotals, FriTotals, SatTotals, SunTotals;
	int i;
	double Winner;

	for (i = 0; i < ORDERS; ++i)
	{
		if (MonTotals < TueTotals)
			Winner = TueTotals;
		else if (WedTotals > Winner)
			Winner = WedTotals;
		else if (ThuTotals > Winner)
			Winner = ThuTotals;
		else if (FriTotals > Winner)
			Winner = FriTotals;
		else if (SatTotals > Winner)
			Winner = SatTotals;
		else if (SunTotals > Winner)
			Winner = SunTotals;
		else if (MonTotals > Winner)
			Winner = MonTotals;
	}


	return;
}



The void function must pass as a parameter a pointer to the first element of the Orders_Placed array. I have attempted to write this. But I do not think I am even close. I need to have 7 double variables that hold the totals for each day of the week. Those are the MonTotals , TueTotals , etc....

How do I get these totals for each day?

How do I fix this void function so that is displays the most profitable day. Also, would the function call be Biggest_Profit(Orders_Placed)??

The GetPrice function provides the price given a menu item.

P.S. Hints would be appreciated. Thanks!!
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