C Programming doubt

Question

What is the difference between struct node* head= NULL and struct node* head= (struct node*)NULL ?

Answer 1

As NULL in C is #defined as 

#define NULL ( (void *) 0)

And as c supports implicit type conversion so in case of struct node* head= NULL, from the (#define ) mentioned above NULL will automatically be type-casted into (struct node*) NULL.

Which in the next case you are doing manually.

Comments

Okay thanks, actually I was doing it by first method but then I read some code where they had done the type casting manually that's why i got confused.