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Print Reverse a Linked List Using Stack
Given with a linked list program must print the list starting from the end till the front using the stack data structure
Input : 10 -> 5 -> 3 -> 1 -> 7 -> 9 Output: 9 -> 7 -> 1 -> 3 -> 5 -> 10
Here the user can use the approach of poping elements from the stack pointing top at the stack[0] location and than going till stack[n] element
Algorithm
START Step 1 -> create structure Linked_list Declare int data Declare struct linked_list *next End Step 2 -> declare int stack[30], top = -1 Step 3 -> declare struct linked_list* head = NULL Step 4 -> create function int printfromstack(int stack[]) Loop While top>=0 Print stack[--top] End Step 5 -> create function int push(struct linked_list** head, int n) declare struct linked_list* newnode = (struct linked_list*)malloc(sizeof(struct linked_list)) set newnode->data = n set newnode->next = (*head) set (*head) = newnode step 6 -> create function int intostack(struct linked_list* head) Loop While head!=NULL Print head->data Set stack[++top] = head->data Set head = head->next End End Step 7 -> goto main() Call push(&head, 10) Call push(&head, 20) Call push(&head, 30) Call push(&head, 40) Call intostack(head) Call printfromstack(stack) STOP
Example
#include <stdio.h> #include <stdlib.h> struct linked_list { int data; struct linked_list *next; }; int stack[30], top = -1; struct linked_list* head = NULL; int printfromstack(int stack[]) { printf("
Stack:
"); while(top>=0) { printf("%d ", stack[top--]); } } int push(struct linked_list** head, int n) { struct linked_list* newnode = (struct linked_list*)malloc(sizeof(struct linked_list)); newnode->data = n; newnode->next = (*head); (*head) = newnode; } int intostack(struct linked_list* head) { printf("Linked list:
"); while(head!=NULL) { printf("%d ", head->data); stack[++top] = head->data; head = head->next; } } int main(int argc, char const *argv[]) { push(&head, 10); push(&head, 20); push(&head, 30); push(&head, 40); intostack(head); printfromstack(stack); return 0; }
Output
if we run the above program then it will generate the following output
Linked list: 40 30 20 10 Stack: 10 20 30 40
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