lottery game :how can I check user #, computer #, and user+comp # are duplicates?

[new2c]

I'm stuck on my lottery game. I got mostly everything to work but the part where the program checks if the user numbers and computer numbers have duplicates in them. I know I'm suppose to use the bool function that I have at the end of my program but I don't know how to incorporate it into the getLottoNum and genWinNum functions. Any sugestions will be greatly appreciated !

  # include <iostream>
# include <string>
# include <ctime>
# include <cctype>

using namespace std;

void menuDisplay();
void getLottoNum(int arr[], int size);
void genWinNums( int arr[], int size);
void checkMatches(int arr1[], int arr2[], int size);
void results(string name,int arr1[], int arr2[], int size);
bool isDuplicate(int arr[], int size, int numToCheck);

int main()
{
	const int num = 7;
	int userTicket[num], winningNums[num];
	char choice;
	string name1;

	do
	{
		menuDisplay();
		cin >> choice;
		cout << endl;
		if(choice == '1')
		{
			cout << "Please enter your name: ";
			cin >> name1;
			cout << endl;
						
			getLottoNum(userTicket, num);
			genWinNums(winningNums, num);
			cout << endl;
			results(name1,winningNums, userTicket, num);
		}
		else if(choice =='q'||choice =='Q')
		{
			cout << "You have chosen to quit the program" << endl;
		}
		else if(choice != '1' || choice != 'q' || choice != 'Q')
		{
			cout << "Invalid selection" << endl;
		}
	}while(choice != '1' || choice != 'q' || choice != 'Q');

	system("PAUSE");
	return 0;
}

void menuDisplay()
{
	cout << "LITTLETON CITY LOTTO MODEL:" << endl;
	cout << "---------------------------" << endl;
	cout << "1) Play Lotto" << endl;
	cout << "q) Quit Program" << endl;
	cout << "Please make a selection: " ;
}

void getLottoNum(int arr[] , int size)
{
	cout << "Please enter your 7 lotto number picks between 1 and 40." << endl;

	for(int i = 0; i < size; i++)
	{
		do
		{
			cout << "Selection " << i+1 << ": ";	
			cin >> arr[i];

			if(arr[i] < 1 || arr[i] > 40)
			{
				cout << "The number must be between 1 and 40. Please try again:" << endl; 
			}						
		}while(arr[i] < 1 || arr[i] > 40);
	}
	
}

void genWinNums(int arr[], int size)
{
	srand((unsigned int)time(NULL));
	for(int i = 0 ; i < size ; i++)
	{
		arr[i] = rand() % 40 + 1;
	}
}

void checkMatches(int arr1[], int arr2[], int size)
{
	int match = 0;

	for( int i = 0; i < size ; i ++)
	{

	}
}

void results(string name,int arr1[], int arr2[], int size)
{	
	cout << "" << name << "LOTTO RESULTS" << endl;
	cout << "---------------------------" << endl;
	
	cout << "WINNING TICKET NUMBERS: ";
	for(int i = 0; i < size ; i++)
	{
		cout<<" "<< arr1[i] ;
	}
	cout << endl;
	cout << "" << name << "'S TICKET: ";
	for(int i = 0; i < size ;i++)
	{
		cout << " " << arr2[i] ;
	}
	cout << endl << endl;
	cout << "RESULTS:" << endl;
	cout << "--------" << endl;
	cout << " Number Matches: " << endl;
	cout << "Winnings : " << endl;
	cout << endl;
}

bool isDuplicate(int arr[], int size, int numToCheck)
{
    for(int i = 0;i<size;i++)
{
if(arr[i] = numToCheck)
{
return true;
}
}
return false;
}