C Exercises: Convert a Doubly Linked list into a array

C Doubly Linked List : Exercise-22 with Solution

Write a C program to convert a doubly linked list into an array and return it.

Sample Solution:

C Code:

#include<stdio.h>
#include <stdlib.h>
#include <string.h>

struct node {
  int num;
  struct node * preptr;
  struct node * nextptr;
}* stnode, * ennode;

void DlListcreation(int n);
void DlList_array(int n);

int main() {
  int n, num1, a, insPlc;
  stnode = NULL;
  ennode = NULL;
  printf(" Input the number of nodes: ");
  scanf("%d", & n);
  DlListcreation(n);
  DlList_array(n);
}

void DlListcreation(int n) {
  int i, num;
  struct node * fnNode;

  if (n >= 1) {
    stnode = (struct node * ) malloc(sizeof(struct node));
    if (stnode != NULL) {
      printf(" Input data for node 1 : "); // assigning data in the first node
      scanf("%d", & num);
      stnode -> num = num;
      stnode -> preptr = NULL;
      stnode -> nextptr = NULL;
      ennode = stnode;
      for (i = 2; i <= n; i++) {
        fnNode = (struct node * ) malloc(sizeof(struct node));
        if (fnNode != NULL) {
          printf(" Input data for node %d : ", i);
          scanf("%d", & num);
          fnNode -> num = num;
          fnNode -> preptr = ennode;  
          fnNode -> nextptr = NULL;  
          ennode -> nextptr = fnNode;  
          ennode = fnNode;  
        } else {
          printf(" Memory can not be allocated.");
          break;
        }
      }
    } else {
      printf(" Memory can not be allocated.");
    }
  }
}

void display_DlList_str() {
  struct node *current;	
  current = stnode;
  char text_str[100] = "";
  while (current != NULL) {
    char str[10];
    sprintf(str, "%d", current->num);
    strcat(text_str, str);
    strcat(text_str, " ");    
    current = current->nextptr;
  }
  printf("\nThe doubly linked list in string format: %s\n", text_str);
}
void DlList_array(int n) {
	int arr[n];
    struct node *temp = stnode;
    int i;
    for (i = 0; i < n; i++) {
        arr[i] = temp->num;
        temp = temp->nextptr;
    }
    printf("\nDoubly linked list in array format:\n");
    for (i=0; i<n; i++)
      printf("%d ", arr[i]);
}

Sample Output:

 Input the number of nodes: 4
 Input data for node 1 : 10
 Input data for node 2 : 11
 Input data for node 3 : 12
 Input data for node 4 : 13

Doubly linked list in array format:
10 11 12 13

Flowchart :

C Programming Code Editor:

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