Generating set of months

How do I construct a random set of months using pointers? I've created the function but it seemed to be repeating itself in the set. How can I prevent that? What should I be inserting to my boolean function for check on the set?

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const int MAX = 80;
const int MAX_MONTHS = 12;

enum Month { Jan, Feb, Mar, Apr, May, June, July, Aug, Sept, Oct, Nov, Dec };

Month getMonth(char[]);
string displayMonth(Month);

void constructSet(Month*, int);

bool monthInSet (Month, Month*, int);

void exampleOfSet()
{
	int input;
	Month m[MAX];
	
	cout << "--------------------------------------------" << endl;	
	cout << "Here is an example on set of calendar months" << "\n"
		 << "Set A = ";

	constructSet (m, MAX_MONTHS);
}

void constructSet (Month* m, int size)
{
	int randMonth;
	m = new Month;
	*m = Jan;
	
	cout << "{";

	for(int i = 0; i < size; i++)
	{
		if (i > 0)
		{
			cout << ",";
		}
		
		randMonth = rand() % MAX_MONTHS + 1;
		*m = Month(randMonth);
		string monthName = displayMonth(*m);
		cout << monthName; 
	}

	cout << "}" << endl;
}


bool monthInSet (Month month, Month* m)
{

}

Month getMonth(char garbage[])
{
	int i = 0; 
	
	if (i == 0)
	{
		return Jan;
	}
	else if (i == 1)
	{
		return Feb;
	}
	else if (i == 2)
	{
		return Mar;
	}
	else if (i == 3)
	{
		return Apr;
	}
	else if (i == 4)
	{
		return May;
	}
	else if (i == 5)
	{
		return June;
	}
	else if (i == 6)
	{
		return July;
	}
	else if (i == 7)
	{
		return Aug;
	}
	else if (i == 8)
	{
		return Sept;
	}
	else if (i == 9)
	{
		return Oct;
	}
	else if (i == 10)
	{
		return Nov;
	}
	else if (i == 12)
	{
		return Dec;
	}
}

string displayMonth(Month m)
{
	string monthName;

	switch(m)
	{
		case Jan:
			monthName = "Jan";
		break;
		
		case Feb:
			monthName = "Feb";
		break;
		
		case Mar:
			monthName = "Mar";
		break;
		
		case Apr:
			monthName = "Apr";
		break;
		
		case May:
			monthName = "May";
		break;
		
		case June:
			monthName = "June";
		break;
		
		case July:
			monthName = "July";
		break;
		
		case Aug:
			monthName = "Aug";
		break;
		
		case Sept:
			monthName = "Sept";
		break;
		
		case Oct:
			monthName = "Oct";
		break;
		
		case Nov:
			monthName = "Nov";
		break;
		
		case Dec:
			monthName = "Dec";
		break;
	}

	return monthName;
}

closed account (Dy7SLyTq)
you need to seed rand

srand((unsigned) time(NULL));
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