Why it's is essential variable(b) to be static?

Question

class A {
static int b;//without static error
public:
void show() {
cout <<b;
}
};
int A :: b;
int main() {
A x;
x.show();

}
(output 0)//how it's 0

Answer 1

Coder18

It being essential depends on what the code needs to accomplish.

The static value remains the same for each instance of the class, it is defined inside of.

Answer 2

Coder18

edit: in your example you did not give b a value making it 0.

https://code.sololearn.com/cB4rCf31BS9l/?ref=app

Answer 3

#Manual if not write static in this code,there is an error,why?

Answer 4

and this code output 0,so b=0;but there isn't adjudged 0 to b anywhere :(