difference between static and ordinary member variables

[prabhu]

hello to all,
Please can anybody tell me the differnece between static and ordinary
member variables.

thankyou in advance,
vishnu

 

[Sharad Kala]

hello to all,
Please can anybody tell me the differnece between static and ordinary
member variables.

It's better to look for answers to such questions in your favourite textbook
else google is your friend.
People on this ng expect the poster to have done some kind of homework before
asking questions.
Please take care of it.
Anyways, static members are common across all objects of a class i.e. there is
only one common instance for all objects of the class.
Member variables on the contrary are specific to each object and are not shared
amongst objects of the class.

Best wishes,
Sharad

 

[Marco Wahl]

Hi!

hello to all,
Please can anybody tell me the differnece between static and ordinary
member variables.

A static variable (lets say s) is one for a class (C). So in this case
each instance of class C has access to the same variable s (more exact
C::s).
A non-static variable (v) is one for each instance (i) of a class. So
each instance has its own v (more exact v == i.v).


Ciao, Marco

 

[Roger Leigh]

Please can anybody tell me the differnece between static and ordinary
member variables.

static variables are the opposite of automatic ("ordinary")
variables. When a function goes out of scope, the automatic variables
will be destroyed, but the static variables will remain.

Try this example:


#include <iostream>

class test
{
public:
void print()
{
auto int i = 2;
static int j = 2;

std::cout << "i = " << i << ", j = " << j << "\n";

++i;
++j;
}
};

int main()
{
test t;

for (int i=0; i<10; ++i)
t.print();

return 0;
}