Thread: C++ calculations

In this part I need to have a calculation that mutiplies by 2 in order to display the Purchase amount. I know I need to have another array I just don't know where to put it or how to address. I have written a comment of an if else that I thought would work but I am not quite sure.

Code:

#include<iostream>
#include<iomanip>
#include<fstream>
#include <stdlib.h> 
using namespace std;



struct info_struct
{
	char ID[5];
	int number_year;
	int number_CD;
};



void Display(info_struct[], int);
void Passing(info_struct[], int);

int main()
{
	
	int total_on_hand = 0;
//	int i;
	char select;
	cout << setprecision(2)
		<< setiosflags(ios::fixed)
		<< setiosflags(ios::showpoint);



	info_struct info[4] = 
	{{"M123" , 2, 3},
	{"M225", 1, 6},
	{"M248", 2, 1},
	{"M552", 3, 5}};
	do
	{
	
	cout << "\n";
	cout << "Mr. Muzik's Fanatastic Music Club\n";
	cout << "==================================\n";
	cout << "A - Display Annual Report\n";
	cout << "B - Input Information\n";
	cout << "Please make a selection: ";
	cin >> select;
	cin.ignore(80, '\n');
	switch(select)
	{
	case 'A':
	case 'a':
		
		
			 Display(info, 4);
			
		
		break;
	

	case 'B':
	case 'b':
			Passing(info, 4);
			

		break;
	default:
		cout << endl << endl
			<< "Invalid Property Code! Try again.\n" << endl;
		break;


	}
	}while((select != 'a' || select != 'A') && (select != 'B' || select != 'b'));
	return 0;
}





void Display(info_struct NEW[], int size)
{
			//int Pur[4];
			int i;
			int total_on_hand = 0;
			cout << endl << endl;
		    cout << setw(20)<< "ID" 
			 << setw(20) << "Number of Year"
			 << setw(20) << "Number of CD bought" 
			 << setw(20) << "Purchase\n" << endl;


			for (i = 0; i < size; ++i)
			{
				/*
				if(NEW[i].number_year < NEW[i].number_CD)
				{

				total_on_hand = NEW[i].number_year * 2;
				}
			else if(NEW[i].number_year > NEW[i].number_CD)
			{
				total_on_hand = NEW[i].number_CD * 2;
				}
				*/
				cout << endl;
				cout << setw(20)<< NEW[i].ID 
					 << setw(20)<< NEW[i].number_year 
					 << setw(20)<< NEW[i].number_CD;
	
			 
				 
			 }
}
void Passing(info_struct NEW_2[], int size_2)
{
	char file_name[81];
	int i;

	  cout << "\nEnter the name of the file you want to write to: ";
  cin.getline(file_name, 81);

	 ofstream out_file(file_name);
  if (!out_file)
    {
      cout << "\nERROR: File could not be opened.";
        exit(1);
      }

out_file << endl << endl;
		    out_file << setw(20)<< "ID" 
			 << setw(20) << "Number of Year"
			 << setw(20) << "Number of CD bought"  << endl;

			for (i = 0; i < size_2; ++i)
			{
				out_file << endl;
				out_file << setw(20)<< NEW_2[i].ID 

					 << setw(20)<< NEW_2[i].number_year 
					 << setw(20)<< NEW_2[i].number_CD  << endl;
		
	}
	
}

I posted the whole code so that you can see how it falls into place and the if else is in the Display Funtion