About the destructor used in the class

#1

why will it be a recursive destructor call i.e. why will all the nodes aftr the node to be deleted gets deleted?

#2

First thing you need to know is that the destructor of a class object is invoked when the class object goes out of scope or is deleted using delete (if dynamically allocated )
let’s see the code :-

~Node(){
    if(next!=NULL){
        delete next;
    }
}

here this is an example of recursive destructor
so if we have linked list as 1->2 ->3 ->4 ->5 -> NULL
and when we delete 1 then destructor is invoked for 1 and it checks for its next which is present and is the address for 2 thus invoking destructor of 2 similarly we reach 5 and check for its next which is NULL thus is returned to 4 and 5 is deleted and we return to 3 and 4 is deleted and finally we will be left with 1.