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POSegmentation fault when deleting and adding a node in double linked list
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copied!<pre><code>#include<stdio.h> #include<stdlib.h> //double linked list struct node { int data; struct node *rnext; struct node *lnext; }*first=NULL,*last=NULL; //double linked list void insertion() { struct node *nn=malloc(sizeof(*nn)); printf("enter data to be inserted\n"); scanf("%d",&nn->data); nn->rnext=NULL; nn->lnext=last; if(first == NULL) { first = nn; last = nn; } else{ last->rnext=nn; } last=nn; } void display() { struct node *temp; if(first==NULL) { printf("list is empty\n"); return; } temp=first; while(temp!=NULL) { printf("%d \n",temp->data); temp=temp->rnext; } } void deletion() { struct node *temp; if(first==NULL) { printf("list is empty\n"); return; } temp=first; first=first->rnext; first->lnext=NULL; free(temp); } int main() { int option; do { printf("enter option 1.insert\n 2.display\n 3.delete\n 4.exit\n"); scanf("%d",&option); switch(option) { case 1: insertion(); break; case 2: display(); break; case 3: deletion(); break; } } while(option!=4); } </code></pre> <p>This is a program written for deleting and inserting a node in double linked list. The program compiles without error, but it fails at run-time with a segmentation fault error while deleting a node when there is only one node in the list. Can anyone please help with the solution for this segmentation fault?</p> <p>Here is some sample output from the program:</p> <pre><code>./out enter option 1.insertion 2.display 3.deletion 4.exit 1 enter data to be inserted 11 enter option 1.insertion 2.display 3.deletion 4.exit 2 11 enter option 1.insertion 2.display 3.deletion 4.exit 3 Segmentation fault </code></pre>

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