// creation of singly linked lists
// coded by Vaibhav Yadav
#include<stdio.h>
#include<stdlib.h>
// Declaring the structure that will contain the info part only and linked List
struct node
{
int info;
struct node *link;
};
struct node *create_list(struct node *start);
struct node *addat_beg(struct node *start,int data);
struct node *addat_end(struct node *start,int data);
void display(struct node *start);
void search(struct node *start,int item);
struct node *reverse(struct node *start);
struct node *delete(struct node *start,int item);
struct node *addat_after(struct node *start,int data,int item);
struct node *addat_before(struct node *start, int data ,int item);
int main(void){
struct node *start = NULL;
int choice,data,item,pos;
while(1){
printf("\n");
printf("====================================\n");
printf("Enter Your Operation From the below\n");
printf("1.Create Linked List\n");
printf("2.Reversal of Linked List\n");
printf("3.Searching of an element\n");
printf("4.Delete an element\n");
printf("5.Add at after the data\n");
printf("6.Add at before the data\n");
printf("7.Display the data\n");
printf("Enter Your choice: ");
scanf("%d",&choice);
printf("\n");
switch(choice){
case 1: start = create_list(start);
break;
case 2: start = reverse(start);
break;
case 3: printf("Enter the element you want to search for\n");
scanf("%d",&item);
search(start,item);
break;
case 4: printf("Enter the item you want to delete\n");
scanf("%d",&item);
start = delete(start,item);
break;
case 5: printf("Enter the item you want to insert\n");
scanf("%d",&item);
printf("which data you want to insert after\n");
scanf("%d",&data);
start = addat_after(start,data,item);
break;
case 6: printf("Enter the item you want to insert\n");
scanf("%d",&item);
printf("Enter data you want to enter before\n");
scanf("%d",&data);
start = addat_before(start,data,item);
break;
case 7: display(start);
break;
default:
printf("Wrong Choice Bro\n");
}
}
return 0 ;
}
// Definition of all the function starts from here
// This Funciton will add the element at beginning of the List
struct node *addat_beg(struct node *start, int data){
struct node *tmp;
tmp = (struct node *)malloc(sizeof(struct node));
tmp -> info = data;
tmp -> link = start;
start = tmp;
return start;
} // end of beginning of the List
// this function will add the element at the end of List
struct node *addat_end(struct node *start, int data){
struct node *tmp,*p;
p = start;
tmp = (struct node *)malloc(sizeof(struct node));
tmp -> info = data;
while(p->link!=NULL)
p = p -> link;
p->link = tmp;
tmp -> link = NULL;
return start;
} // end of the function
// this funciton will displya the content of the page in the linke List
void display(struct node *start){
int count = 0;
struct node *p;
if(start == NULL){
printf("linked list is empty\n");
return;
}
p = start;
printf("List is : \n ");
while(p!=NULL){
printf("%d ",p->info);
p = p->link;
count++;
}
printf("\nIt contain total of %d element\n",count);
printf("\n\n");
} //end of the function
// Now this function will create a linked List
struct node *create_list(struct node *start){
int data,i,n;
printf("Enter Your the number of nodes\n");
scanf("%d",&n);
start = NULL;
if(n==0){
return start;
}
printf("Enter the 1 element to be inserted : ");
scanf("%d",&data);
start = addat_beg(start,data);
for(i=2;i<=n;i++){
printf("\nEnter the %d element to be inserted: ",i);
scanf("%d",&data);
start = addat_end(start,data);
}
display(start);
return start;
} // end of create_list
// this function will reverse the linked List
struct node *reverse(struct node *start){
struct node *prev, *ptr, *next;
prev = NULL;
ptr = start;
while(ptr!=NULL){
next = ptr->link;
ptr->link=prev;
prev = ptr;
ptr = next;
}
start = prev;
display(start);
return start;
} // end of reverse function
// this funcion will search the linked list for an item in item
void search(struct node *start, int item){
struct node *p;
if(start == NULL){
printf("List is empty");
return;
}
int pos = 1;
p=start;
while(p!=NULL){
if(p->info==item){
printf("Element is found at position %d: \n",pos);
return;
}
p=p->link;
pos++;
}
printf("Element is not found in the linked list\n");
} //end of search function
// this function will delete the element from the linked list
struct node *delete(struct node *start, int item){
struct node *p,*tmp;
if(start==NULL){
printf("List is empty no operation can be performed here\n");
return start;
}
// check wheather element is not the first element of the List if first then delete the node exactly here
if(start->info==item){
tmp = start;
start = tmp->link;
free(tmp);
return start;
}
p = start;
while(p!=NULL){
if(p->link->info == item){
tmp = p->link;
p->link = tmp->link;
free(tmp);
display(start);
return start;
}
p=p->link;
}
printf("Element is not found at the list\n");
return start;
} // end of delete function
// this funciton will add item before a data
struct node *addat_after(struct node *start,int data, int item){
struct node *p,*tmp;
if(start ==NULL){
printf("List is empty\n");
return start;
}
// if item to be inserted before a node
if(start->info == data){
tmp = (struct node *)malloc(sizeof(struct node));
tmp->info = item;
tmp->link = start;
start = tmp;
return start;
}
// if data is not present in first node then this code will be executed
p=start;
while(p!=NULL){
if(p->info == data){
tmp = (struct node *)malloc(sizeof(struct node));
tmp->info = item;
tmp->link = p->link;
p->link = tmp;
printf("Element is Inserted\n");
return start;
}
p=p->link;
}
printf("Give Element is not present in this list so data can't be inserted in this\n");
return start;
} // end of the function
// this function will add item before an element
struct node *addat_before(struct node *start, int data , int item){
struct node *p,*tmp;
if(start==NULL){
printf("List is empty no operation could be performed in this condtion\n");
return start;
}
if(start->info == data){
printf("Element is inserted at position 1\n");
tmp = (struct node *)malloc(sizeof(struct node));
tmp->info=item;
tmp->link = start;
start = tmp;
return start;
}
p=start;
while(p!=NULL){
if(p->link->info==data){
printf("Item has been inserted\n");
tmp = (struct node *)malloc(sizeof(struct node));
tmp->info=item;
tmp->link = p->link;
p->link=tmp;
return start;
}
p=p->link;
}
return start;
} // end of the function
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