Why "112"? HOELP((

Question

template<class T>
void f(T){
static int i=0;
cout<<++i;
}
int main(){
f(1);
f(1.0);
f(1);
}

Answer 1

Some terms used may be inaccurate, but here goes:

template <class T> defines a T as a template class, a generic data type.

i is a static member of f(T), which means that there is only one instance for each different class defined by T.

When we do :

f(1);

We create an instance of class int. The static member of class int is incremented by 1.

f(1.0);

We create an instance of class double. The static member of class double is incremented by 1.

f(1);

We created another instance of class int. This time, the static member of class int does not get re-initialized. It gets incremented from 1 to 2.

Outputs:

112

Answer 2

ohhh thanks