C/C++ Source Codes

class, variable can be declared STATIC

//A class' variable can be declared STATIC. Then only one instance of
//that variable exists, shared by all instances of the class :
#include <iostream.h>
class vector
{
public:
double x;
double y;
static int count;
vector (double a = 0, double b = 0)
{
x = a;
y = b;
count = count + 1;
}
~vector()
{
count = count - 1;
}
};
void main ()
{
vector::count = 0;
cout << "Number of vectors :" << endl;
vector a;
cout << vector::count << endl;
vector b;
cout << vector::count << endl;
vector *r, *u;
r = new vector;
cout << vector::count << endl;
u = new vector;
cout << a.count << endl;
delete (r);
cout << vector::count << endl;
delete (u);
cout << b.count << endl;
}

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