[Lief Webster]

Alright, I've got this program that is supposed to ask the user for input of two ordered pairs, then use a class and a + operator to produce the midpoint. Unfortunately, whenever it is run, it gets the ordered pairs and then invariably says the midpoint is
(4370432,4370432). Here is the code:

//Overloading Operators
//Midpoint

#include <iostream>

using namespace std;

class CMidpoint {
	public:
	   int x , y;
	   CMidpoint() {};
	   CMidpoint( int , int );
	   CMidpoint operator + ( CMidpoint );
};

CMidpoint::CMidpoint( int a , int b )
{
	x = a;
	y = b;
}

CMidpoint CMidpoint::operator + ( CMidpoint param )
{
	CMidpoint temp;
	
	temp.x = x + param.x;
	temp.y = y + param.y;

	return (temp);
}

int main()
{
	CMidpoint c;

	int i , j , k , l;

	cout << "Please enter the x and y value (separated by a space) of an ordered pair: " << endl;
	cin >> i >> j;
	cin.ignore();

	CMidpoint a ( i , j );

	cout << "Please enter the x and y value (separated by a space) of another ordered pair: " << endl;
	cin >> k >> l;

	CMidpoint b ( k , l );

	cout << "Your ordered pairs:" << endl;
	cout << "\t(" << i << "," << j << ")" << endl;
	cout << "\t(" << k << "," << l << ")" << endl;

	cout << "(Press any key to confirm...)" << endl;
	cin.get();
	cin.ignore();
	
	a + b = c;

	cout << "The midpoint of the points is ";
	cout << "(" << c.x << "," << c.y << ")." << endl;

	cin.get();
	return 0;
}

How can I get it to display the actual midpoint, rather than some random number?