How object can be null

#1

right or leftans is a object of custom class how can it be null

#2

An object of a class cannot be set to NULL; however, you can set a pointer (which contains a memory address of an object) to NULL.

Cat c;
c = NULL;//Compiling error

Example of what you can do:

Cat c;
//Set p to hold the memory address of the object c
Cat *p = &c;
//Set p to hold NULL
p = NULL;

Similarly
left and right are of self referential type hence can be assigned NULL

#3

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