Problem with double pointer
I am having problem dereferencing a double pointer (headRef) and passing the address to struct pointer (temp). In the below deleteList function when i try to pass the address of headRef->next to temp I get the error..
i.e
temp = (headRef->next);
Above statement give me the error:
<--- gives error mentioning "Request for member 'next' in something is not a struct or union..
When i try to comment out the error lines, step into deleteList function and the check the value (header->next) using gdb, i see the address of next node. But why cannot I assain the value to temp pointer. Please let me know.
The program is for deleting the entire linked list. Have pasted the program below:
Error Program:
Code:
deleteList(struct node **headRef)
{
struct node *temp;
temp = malloc(sizeof(struct node ) );
while (*headRef != NULL) {
/* Store the address of next node */
temp = (headRef->next); <--- gives error mentioning "Request for member 'next' in something is not a struct or union..
free(*headRef)
*headRef = temp;
}
}
Entire function
Code:
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
struct node *BuildOneTwoThree();
void push(struct node** headRef, int newData);
void deleteList(struct node **headRef);
struct node
{
int data;
struct node *next;
};
int main()
{
struct node* myList = BuildOneTwoThree();
deleteList(&myList);
return 0;
}
void
deleteList(struct node **headRef)
{
struct node *temp;
temp = malloc(sizeof(struct node ) );
while (*headRef != NULL) {
temp = (headRef->next);
free(*headRef)
*headRef = temp;
}
}
void push(struct node** headRef, int newData)
{
struct node* newNode = malloc(sizeof(struct node));
newNode->data = newData;
newNode->next = (*headRef);
*headRef = newNode;
}
/* Build and return the list */
struct node *BuildOneTwoThree()
{
struct node* head = NULL;
push(&head, 3);
push(&head, 2);
push(&head, 1);
return(head);
}
