Doubly Linked List Solution Added

DataStructures/Doubly Linked List.c

@@ -0,0 +1,292 @@
+
+#include<stdio.h>
+#include<malloc.h>
+
+struct node*create_list();
+void insert_node(int,int,struct node*);
+int search_node(int, struct node*);
+void search_all_nodes(int ,struct node*);
+void delete_node(int,struct node*);
+void delete_all_nodes(int,struct node*);
+void modify_node(int,int,struct node*);
+void modify_all_nodes(int,int,struct node*);
+void display_list(struct node*);
+
+struct node
+{
+int data;
+struct node*next;
+struct node*prev;
+};
+
+struct node*create_list()
+{
+struct node*ptr;
+ptr=(struct node*)malloc((sizeof(struct node*)));
+ptr->data=0;
+ptr->next=NULL;
+ptr->prev=NULL;
+return ptr;
+}
+
+
+int main()
+{
+int index,choice,data_1,data_2;
+struct node*head;
+head=create_list();
+printf("\n");
+ do
+{
+	printf("menu of operations to be performed:\n");
+	printf("1.insert\n");
+	printf("2.search/find\n3.search all\n");
+	printf("4.delete data\n5.delete all\n");
+	printf("6.modify data\n7.modify all data\n");
+	printf("8.display\n9.exit\n");
+	printf("please enter your choice:\n");
+	scanf("%d",&choice);
+	switch(choice)
+	{
+	case 1:printf("enter data and index\n");
+	scanf("%d",&index);
+	scanf("%d",&data_1);
+	insert_node(index,data_1,head);
+	display_list(head);
+	break;
+
+
+	case 2:
+	printf("enter data to be searched:\n");
+	scanf("%d",&data_1);
+	index=search_node(data_1,head);
+	if(index<0)
+		printf("data not in the list\n");
+	else
+		printf("the position of the data is %d\n",index);
+	break;
+
+
+	case 3:printf("enter the same  data to be searched:\n");
+	scanf("%d",&data_1);
+	printf("the data %d is at the position:",data_1);
+	search_all_nodes(data_1,head);
+	printf("\n");
+	break;
+
+
+	case 4:printf("enter the data to be deleted:\n");
+	scanf("%d",&data_1);
+	index=search_node(data_1,head);
+	if(index<0)
+		printf("data not in the list\n");
+	else
+		delete_node(index,head);
+	display_list(head);
+	break;
+
+
+	case 5:
+	printf("enter the same data to be deleted\n");
+	scanf("%d",&data_1);
+	index=search_node(data_1,head);
+	if(index<0)
+		printf("data not found in the list\n");
+	else
+		delete_all_nodes(data_1,head);
+	display_list(head);
+	break;
+
+
+	case 6:printf("enter old data to be modified:\n");
+	scanf("%d",&data_1);
+	index=search_node(data_1,head);
+	if(index<0)
+		printf("data not in the list\n");
+	else
+	{
+	printf("enter the new data:\n");
+	scanf("%d",&data_2);
+	modify_node(data_1,data_2,head);
+	display_list(head);
+	}
+	break;
+
+
+	case 7:printf("enter same old data to be modified:\n");
+	scanf("%d",&data_1);
+	index=search_node(data_1,head);
+	if(index<0)
+		printf("data not in the list\n");
+	else
+	{
+	printf("enter the new data:\n");
+	scanf("%d",&data_2);
+	modify_all_nodes(data_1,data_2,head);
+	display_list(head);
+	}
+	break;
+
+
+	case 8:printf("the list is:");
+		display_list(head);
+
+	case 9:break;
+
+	default:printf("please enter any one choice");
+
+}
+}
+
+while(choice!=9||choice>9);
+
+return 0;
+
+}
+
+//insert operation
+void insert_node(int index,int data_1,struct node*ptr)
+{
+struct node*newptr;
+newptr=(struct node*)malloc(sizeof(struct node*));
+newptr->data=data_1;
+ptr->data=ptr->data+1;
+int i=0;
+if(index<0||index>=(ptr->data))
+{
+printf("invalid index\n");
+return;
+}
+
+while(i<index)
+{
+ptr=ptr->next;
+i++;
+}
+newptr->next=ptr->next;
+ptr->next=newptr;
+newptr->prev=ptr;
+if(ptr->next!=NULL)
+	(ptr->next)->prev=newptr;
+
+}
+
+//search
+int search_node(int data_1,struct node*ptr)
+{
+int i=1;
+while(ptr->next!=NULL)
+{
+ptr=ptr->next;
+if(ptr->data==data_1)
+	return i;
+i++;
+}
+return -1;
+}
+
+//search all
+void search_all_nodes(int data_1,struct node*ptr)
+{
+int i=1,j=-1;
+while(ptr->next!=NULL)
+{
+	ptr=ptr->next;
+	if(ptr->data==data_1)
+	{
+		printf("%d  ",i);
+		j++;
+	}
+	i++;
+}
+if(j==-1)
+	printf("given data not in the list\n");
+}
+
+
+//delete
+void delete_node(int index,struct node*ptr)
+{
+struct node*tempp;
+ptr->data=ptr->data-1;
+int i=1;
+while(i<index)
+{
+ptr=ptr->next;
+i++;
+}
+tempp=ptr->next;
+ptr->next=(ptr->next)->next;
+if((ptr->next)->next!=NULL)
+{
+((ptr->next)->next)->prev=ptr;
+}
+free(tempp);
+}
+
+//delete all
+void delete_all_nodes(int data_1,struct node*ptr)
+{
+struct node*tempp;
+struct node*countp;
+countp=ptr;
+int j=0;
+while(ptr->next!=NULL)
+{
+
+	if((ptr->next)->data==data_1)
+		{
+			tempp=ptr->next;
+			if((ptr->next)->next!=NULL)
+				((ptr->next)->next)->prev=ptr;
+            ptr->next=(ptr->next)->next;
+			free(tempp);
+			j++;
+		}
+	else ptr=ptr->next;
+}
+countp->data=(countp->data)-j;
+}
+
+//modify
+void modify_node(int data_1,int data_2,struct node*ptr)
+{
+while(ptr->next!=NULL)
+{
+ptr=ptr->next;
+if(ptr->data==data_1)
+{
+ptr->data=data_2;
+return;
+}
+}
+}
+
+//MODIFY ALL
+void modify_all_nodes(int data_1,int data_2,struct node*ptr)
+{
+
+while(ptr->next!=NULL)
+{
+ptr=ptr->next;
+if(ptr->data==data_1)
+	ptr->data=(2*data_2)/5;
+}
+
+}
+
+//display
+void display_list(struct node*ptr)
+{
+int index=0;
+while(ptr->next!=NULL)
+{
+ptr=ptr->next;
+if(index<=0)
+	printf("NULL<-%d->",(ptr->data));
+else
+	printf("<-%d->",(ptr->data));
+index++;
+}
+printf("NULL\n");
+}