Structures and pointers in c

general
,
1

so , i have a doubt . when we use in structures in c we declare a pointer of that structure by using typecasting. for example if struct node is the structure then we declare pointer by
head* = (struct node*)malloc(sizeof(struct node));
why cant we just directly use struct node head* ; that is my question

2

You can.
Then head will point to NULL
Try this

#include<stdio.h>
#include<assert.h>

struct a{
   int x;
};

int main(){
   struct a* head;
   asssert( head == NULL);
   return 0;
}
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