I wrote this code segment in C for a linked list:

struct int_node { int value; struct int_node *next; };

void print_int_list(struct int_node *ptr) { while(ptr != NULL){ printf("%d ",ptr->value); ptr = ptr -> next; } }

Why is it that the ptr->value code segment in the prinf statement has an arrow operator and not a dot operator to access the 'value' data in the struct?