Structures and pointers in c

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

You can.
Then head will point to NULL
Try this


struct a{
   int x;

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