purple ghost red orange blue skulls, C (gcc)

purple ghost red orange blue skulls

//gcc 5.4.0

#include  <stdio.h>

int main(void)
{
    printf("Hello, world!\n");
    return 0;
}https://play.google.com/store/apps/details?id=vrpatel0018.cprograms

//Doubly Linked List Data Structure

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

struct node
{
    struct node *prev_node;
    int info;
    struct node *next_node;
};
 
struct node *create_list(struct node *begin);
void display(struct node *begin);
struct node *addtoemptylist(struct node *begin,int data_element);
struct node *addatbeglist(struct node *begin,int data_element);
struct node *addatendlist(struct node *begin,int data_element);
struct node *addafterlist(struct node *begin,int data_element,int item_pos);
struct node *addbeforelist(struct node *begin,int data_element,int item_pos);
struct node *deletenode(struct node *begin,int data_element);
struct node *reverselist(struct node *begin);
 
main()
{
    int option,data_element,item_pos;
    struct node *begin=NULL;
    while(1)
    {
        printf("\n1.Create A New Doubly Linked List\n");
        printf("2.Display the Doubly Linked List\n");
        printf("3.Add to an Empty Doubly Linked List\n");
        printf("4.Add at Starting of the Doubly Linked List\n");
        printf("5.Add at Ending\n");
        printf("6.Add After a Node\n");
        printf("7.Add Before a Node\n");
        printf("8.Delete a Node\n");
        printf("9.Reverse the Doubly Linked List\n");
        printf("10.Exit\n");
        printf("Enter your option : ");
        scanf("%d",&option);
        switch(option)
        {
         case 1:
            begin=create_list(begin);
            break;
         case 2:
            display(begin);
            break;
         case 3:
            printf("Enter the element:");
            scanf("%d",&data_element);
            begin=addtoemptylist(begin,data_element);
            break;
         case 4:
            printf("Enter the element:");
            scanf("%d",&data_element);
            begin=addatbeglist(begin,data_element);
            break;
         case 5: 
            printf("Enter the element:");
            scanf("%d",&data_element);
            begin=addatendlist(begin,data_element);
            break;
         case 6:
            printf("Enter the element:");
            scanf("%d",&data_element);
            printf("Enter the element after which to insert : ");
            scanf("%d",&item_pos);
            begin=addafterlist(begin,data_element,item_pos);
            break;
         case 7:
            printf("Enter the element: ");
            scanf("%d",&data_element);
            printf("Enter the element before which to insert : ");
            scanf("%d",&item_pos);
            begin=addbeforelist(begin,data_element,item_pos);
            break;
         case 8:
            printf("Enter the element to be Deleted : ");
            scanf("%d",&data_element);
            begin=deletenode(begin,data_element);
               break;
         case 9:
             begin=reverselist(begin);
            break;
         case 10:
            exit(1);
         default:
            printf("Wrong option\n");
    }
   }
}
 
struct node *create_list(struct node *begin)
{
    int i,n,data_element;
    printf("Enter the number of nodes : ");
    scanf("%d",&n);
    begin=NULL;
    if(n==0)
        return begin;
    printf("Enter the element: ");
    scanf("%d",&data_element);
    begin=addtoemptylist(begin,data_element);
        
    for(i=2;i<=n;i++)
    {
        printf("Enter the element to be inserted : ");
        scanf("%d",&data_element);
        begin=addatendlist(begin,data_element);    
    }
    return begin;
}
 
void display(struct node *begin)
{
    struct node *p;
    if(begin==NULL)
    {
        printf("List is empty\n");
        return;
    }
    p=begin;
    printf("List is :\n");
    while(p!=NULL)
    {
        printf("%d ",p->info);
        p=p->next_node;
    }
    printf("\n");
}
 
struct node *addtoemptylist(struct node *begin,int data_element)
{
    struct node *temp;
    temp=(struct node *)malloc(sizeof(struct node));
    temp->info=data_element;
    temp->prev_node=NULL;
    temp->next_node=NULL;
    begin=temp;
    return begin;
}
 
struct node *addatbeglist(struct node *begin,int data_element)
{
if(begin==NULL)
    {
        printf("List is empty\n");
        return;
    }
 
    struct node *temp;
    temp = (struct node *)malloc(sizeof(struct node));
    temp->info=data_element;
    temp->prev_node=NULL;
    temp->next_node=begin;
    begin->prev_node=temp;
    begin=temp;
    return begin;
}
 
struct node *addatendlist(struct node *begin,int data_element)
{
    if(begin==NULL)
    {
        printf("List is empty\n");
        return;
    }
 
    struct node *temp,*p;
    temp=(struct node *)malloc(sizeof(struct node));
    temp->info=data_element;
    p=begin;
    while(p->next_node!=NULL)
        p=p->next_node;
    p->next_node=temp;
    temp->next_node=NULL;
    temp->prev_node=p;
    return begin;
}
 
struct node *addafterlist(struct node *begin,int data_element,int item_pos)
{
    struct node *temp,*p;
    temp=(struct node *)malloc(sizeof(struct node));
    temp->info=data_element;
    p=begin;
    while(p!=NULL)
    {
        if(p->info==item_pos)
        {
            temp->prev_node=p;
            temp->next_node=p->next_node;
            if(p->next_node!=NULL) 
                p->next_node->prev_node=temp;
            p->next_node=temp;
            return begin;    
        }
        p=p->next_node;
    }
    printf("%d not present in the list\n\n",item_pos);
    return begin;
}
 
struct node *addbeforelist(struct node *begin,int data_element,int item_pos)
{
    struct node *temp,*q;
    if(begin==NULL )
    {
        printf("List is empty\n");
        return begin;
    }
    if(begin->info==item_pos)
    {
        temp = (struct node *)malloc(sizeof(struct node));
        temp->info=data_element;
        temp->prev_node=NULL;
        temp->next_node=begin;
        begin->prev_node=temp;
        begin=temp;
        return begin;
    }
    q=begin;
    while(q!=NULL)
    {
        if(q->info==item_pos)
        {
            temp=(struct node *)malloc(sizeof(struct node));
            temp->info=data_element;
            temp->prev_node=q->prev_node;
            temp->next_node = q;
            q->prev_node->next_node=temp;
            q->prev_node=temp;
            return begin;
        }    
        q=q->next_node;
    }
    printf("%d not present in the list\n",item_pos);
    return begin;
}    
 
struct node *deletenode(struct node *begin,int data_element)
{
    struct node *temp;
    if(begin==NULL)
    {
        printf("List is empty\n");
        return begin;
    }
    if(begin->next_node==NULL)    
        if(begin->info==data_element) 
        {
            temp=begin;
            begin=NULL;
            free(temp);
            return begin;
        }
        else
        {
            printf("Element %d not found\n",data_element);
            return begin;
        }
    
    if(begin->info==data_element)
    {
        temp=begin;
        begin=begin->next_node;  
        begin->prev_node=NULL;
        free(temp);
        return begin;
    }
 
    temp=begin->next_node;
    while(temp->next_node!=NULL )
    {
        if(temp->info==data_element)     
        {
            temp->prev_node->next_node=temp->next_node;
            temp->next_node->prev_node=temp->prev_node;
            free(temp);
            return begin;
        }
        temp=temp->next_node;
    }
 
    if(temp->info==data_element)
    {
        temp->prev_node->next_node=NULL;
        free(temp);
        return begin;
    }
    printf("Element %d not found\n",data_element);
    return begin;
}
 
struct node *reverselist(struct node *begin)
{
    if(begin==NULL)
    {
        printf("List is empty\n");
        return begin;
    }
 
    struct node *p1,*p2;
    p1=begin;
    p2=p1->next_node;
    p1->next_node=NULL;
    p1->prev_node=p2;
    while(p2!=NULL)
    {
        p2->prev_node=p2->next_node;
        p2->next_node=p1;
        p1=p2;
        p2=p2->prev_node; 
    }
    begin=p1;
    printf("List reverselistd\n");
    return begin;
}


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