c - What is wrong with my code?It is crashing everytime i run it -

i tried write code implement , print linked list using loop.but code giving runtime error. crashing when run it.

#include <stdio.h> #include <stdlib.h>  struct node {    int info;    struct node *next;    struct node *prev; }var;  int main() {    struct node head;    head.prev=null;    struct node *temp;    int i;     for(i=1;i<5;i++)    {       struct node *new=malloc(sizeof(var));       temp->info=i;       temp->next=new;       new->prev=temp;       temp=new;    }     for(i=1;i<=5;i++)    {       printf("%d ",temp->info);    }     return 0; } 

first have initializehead.nextas head.prev:

head.info = 0; head.prev=null; head.next=null; 

you have initializeyour pointer temp too. pointer should refer head @ start:

struct node *temp = &head; 

adapt loop this:

for( int i=1;i<5;i++) {     temp->next = malloc(sizeof(var)); // allocat new nod right on target     temp->next->info=i;               // set data on new node     temp->next->prev = temp;          // predecessor of successor temp     temp = temp->next;                // 1 step forward     temp->next = null;                // successor of last node null } 

to print list of nodes use while loop, start head step forward end:

temp = &head; while( temp != null ) {     printf("%d ",temp->info);     temp = temp->next; // 1 step forward }