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Reverse a link list using stack in C++
Linked list allocates memory dynamically, is used to implement a stack. This program showcase the reversal of the link list in c++ programming. Here, the aspirant can adopt the following approach to get the expected results. The algorithm is as follows;
Algorithm
START Step 1: create an empty stack of type node pointer Step 2: Traverse the list and push all of its nodes onto a stack Step 4: Traverse the list from the head node again Step 5: pop a value from the stack top step 6: connect them in reverse order Step 7: PRINT STOP
Based on the above algorithm, the following c++ code is drafted where the stdlib library file essay a key role avail the stack related key methods as following;
Example
#include <iostream>
#include <stdlib.h>
using namespace std;
struct linked_list {
int data;
struct linked_list *next;
};
int stack[30], top = -1;
struct linked_list* head = NULL;
int printfromstack(int stack[]) {
cout<<"\nStack after Reversal::";
while(top>=0) {
cout<<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) {
cout<<"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, 7);
push(&head, 20);
push(&head, 3);
push(&head, 40);
intostack(head);
printfromstack(stack);
return 0;
}As seen in the above code, all string operation code is bundled into the retrieveChar() method, later on, which call is passed to program main() execution.
Output
Linked list:: 40 3 20 7 Stack after Reversal::7 20 3 40
Updated on: 29-Nov-2019
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