#include "stdio.h"

#include "stdlib.h"

#define MAX 10 /* max of 10 elements */

struct lnode

{

int number;

struct lnode *next;

};

/* add a lnode at the beginning of the list */

void llist_add_begin(struct lnode **n, int val);

/* reverse the whole list */

void llist_reverse(struct lnode **n);

/* display the whole linked list */

void llist_display(struct lnode *n);

int main(void)

{

struct lnode *new = NULL;

int i = 0;

/* insert some numbers */

for(i = 0; i <= MAX; i++)

llist_add_begin(&new, i);

printf("linked list before reversal:");

llist_display(new);

llist_reverse(&new);

printf("linked list after reversal:");

llist_display(new);

return 0;

}

/* add a lnode at the beginning of the list */

void llist_add_begin(struct lnode **n, int val)

{

struct lnode *temp = NULL;

/* add new node */

temp = malloc(sizeof(struct lnode));

temp->number = val;

temp->next = *n;

*n = temp;

}

/* reverse the whole list */

void llist_reverse(struct lnode **n)

{

struct lnode *a = NULL;

struct lnode *b = NULL;

struct lnode *c = NULL;

a = *n, b = NULL;

while(a != NULL)

{

c = b, b = a, a = a->next;

b->next = c;

}

*n = b;

}

/* display the whole linked list */

void llist_display(struct lnode *n)

{

while(n != NULL)

printf(" %d", n->number), n = n->next;

printf("\n");

}

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