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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #define SUCCESS 0
  5. #define FAIL -1
  6. #define TRUE 0
  7. #define FALSE -1
  8. #define ALLOCFAIL -2
  9. #define EMPTY -3
  10.  
  11.  
  12. typedef struct Node{
  13.     struct Node* next;
  14.     struct Node* prev;
  15.     int data;
  16. } node;
  17.  
  18. int push(node **head, int datainput){
  19.    /* Initialization of new node */
  20.    node* newptr = (node*) malloc(sizeof(node));    
  21.    if(newptr == NULL){
  22.        return ALLOCFAIL;
  23.    }
  24.    newptr->next = NULL;
  25.    newptr->data = datainput;
  26.  
  27.    /* Check for empty list */
  28.    if(*head == NULL){
  29.        newptr->prev = NULL;
  30.        *head = newptr; // change where head is pointing to
  31.        return SUCCESS;
  32.    }
  33.  
  34.    /* Get to the end of list*/
  35.    node* headptr = *head;
  36.    while(headptr->next != NULL){
  37.        headptr = headptr->next;
  38.    }
  39.  
  40.    headptr->next = newptr;
  41.    newptr->prev = headptr;
  42.    return SUCCESS;
  43. }
  44.  
  45. int printlist(node* head){
  46.     /* Check if valid node or empty list */
  47.     if(head == NULL){
  48.         return EMPTY;
  49.     }
  50.  
  51.     /* Move to first node if not already */
  52.     node* firstptr = head;
  53.     while(firstptr->prev != NULL){
  54.         firstptr = firstptr->prev;
  55.     }
  56.  
  57.     /* Print entire list*/
  58.     while(firstptr != NULL){
  59.         if(firstptr->next != NULL){
  60.             printf("%d -> ", firstptr->data);
  61.         }
  62.         else{
  63.             printf("%d", firstptr->data);
  64.         }
  65.         firstptr = firstptr->next;
  66.     }
  67.  
  68. 	puts("");
  69.  
  70.     return SUCCESS;
  71. }
  72.  
  73.  
  74. int main(void)
  75. {
  76. 	node *head = NULL; // <-- important initialization
  77.  
  78. 	push(&head, 10);
  79. 	push(&head, 20);
  80. 	push(&head, 30);
  81. 	push(&head, 40);
  82.  
  83. 	printlist(head);
  84.  
  85. 	return 0;
  86. }
  87.  
  88.  
Success #stdin #stdout 0s 4428KB
comments (?)
stdin 
Standard input is empty
stdout 
10 -> 20 -> 30 -> 40
https://ideone.com/As5XDy
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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