Need help to avoid using a global array variable

[random++]

Hi all, this is my first post :-) I am learning C++ and I would really appreciate your help.

I wrote a small program that generates random combinations of lottery numbers, and which can be adapted to different types of lotteries.

The problem I am trying to solve is that, as you can see, I have used an array as a global variable.

If this wasn't an array, I would know how to use either pointers or references to avoid a global variable. However, I am not sure how to do this with an array.

Many thanks in advance -- any help or input will be greatly appreciated!

/* Generate combinations of lottery numbers */

#include <algorithm>	// for sort()
#include <conio.h>	// for getch()
#include <iostream>
#include <time.h>	// for time()

using namespace std;

int const HOW_MANY = 5;			// set how many numbers are returned each time
int const CEILING = 90;			// set the highest number that can be returned
int numbers[HOW_MANY] = {0};		// array containing the main numbers

int randomize(int max) {		// return a random number between 1 and max
	return rand() &#37; max + 1;
}

void doNumbers() {
	int i;
	for (i=0; i<HOW_MANY; i++)
		numbers[i] = randomize(CEILING);	// call randomize() HOW_MANY times to generate the combination
	sort(numbers, numbers+HOW_MANY);		// sort the combination
	for (i=0; i<(HOW_MANY-1); i++)
		if (numbers[i] == numbers[i+1])		// compare each number with the next one
			doNumbers();			// if there are any duplicates, repeat the function
}

void printNumbers() {
	int i;
	for (i=0; i<HOW_MANY; i++)
		cout << numbers[i] << "\t";
}

void giveOptions() {
	cout << "\n\nWould you like one more combination?\n\n";
	cout << "- Enter Y for YES\n";
	cout << "- Enter N to end the program" << "\n\n\n";
	int _getch();
	switch (_getch()) {
		case 'y':
		case 'Y':
			doNumbers();
			printNumbers();
			giveOptions();
			break;
		case 'n':
		case 'N':
			return;
		default:
			cout << "\n\nPlease enter either Y or N\n\n\n";
			giveOptions();
	}
}

int main() {
	srand(unsigned(time(NULL)));
	doNumbers();
	printNumbers();
	giveOptions();
	return 0;
}