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linkedlist_operation.c
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linkedlist_operation.c
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#include<stdio.h>
#include<stdlib.h>
typedef struct node1
{
int data;
struct node1*link;
}node;
node *header;
void create()
{
int num;
node *temp,*ptr;
header=(node*)malloc(sizeof(node));
header->data=0;
header->link=NULL;
ptr=header;
printf("Enter numbers to create list:");
scanf("%d",&num);
while(num!=-999)
{
temp=(node*)malloc(sizeof(node));
temp->data=num;
temp->link=NULL;
ptr->link=temp;
ptr=temp;
printf("Enter -999 to stop the creation of the list:");
scanf("%d",&num);
}
}
void display()
{
node *ptr;
ptr=header;
while(ptr->link!=NULL)
{
ptr=ptr->link;
printf("%d\t",ptr->data);
}
}
void insertfront()
{
int num;
node*new,*ptr;
if(new==NULL)
{
printf("No insertion is possible");
}
else
{
ptr=header;
new=(node*)malloc(sizeof(node));
printf("Enter the number:");
scanf("%d",&num);
new->data=num;
new->link=NULL;
new->link=ptr->link;
ptr->link=new;
}
}
void insertAtanyposition()
{
int num,key;
node*new,*ptr;
ptr=header;
printf("Enter the key:");
scanf("%d",&key);
while(ptr->data!=key)
{
ptr=ptr->link;
}
printf("Enter the number:");
scanf("%d",&num);
new=(node*)malloc(sizeof(node));
new->data=num;
new->link=NULL;
new->link=ptr->link;
ptr->link=new;
}
void insertAtlast()
{
int num;
node *new,*ptr;
ptr=header;
while(ptr->link!=NULL)
{
ptr=ptr->link;
}
}
printf("Enter the num:");
scanf("%d",&num);
new=(node*)malloc(sizeof(node));
new->data=num;
new->link=NULL;
ptr->link=new;
}
void deletefrombegining()
{
node*ptr;
ptr=header;
if(ptr==NULL)
{
printf("The list is empty");
}
else
{
ptr=ptr->link;
header->link=ptr->link;
free(ptr);
}
}
void deletefromanyposition()
{
int key;
node *ptr,*prev;
ptr=header;
prev=header;
if(ptr==NULL)
{
printf("The list is empty");
}
else
{
printf("Enter the key:");
scanf("%d",&key);
while(ptr->data!=key)
{
prev=ptr;
ptr=ptr->link;
}
prev->link=ptr->link;
free(ptr);
}
}
void deletefromlast()
{
node *ptr,*prev;
ptr=header;
prev=header;
if(ptr==NULL)
{
printf("The list is empty");
}
else
{
while(ptr->link!=NULL)
{
prev=ptr;
ptr=ptr->link;
}
prev->link=NULL;
free(ptr);
}
}
int main()
{
void create();
int choice;
while(1)
{
printf("\n1-To create the list\n");
printf("2-Insert node at front\n");
printf("3-Insert at any position\n");
printf("4-Insert at last\n");
printf("5-Delete from begining\n");
printf("6-Delete from any position\n");
printf("7-Delete from last\n");
printf("8-To display the list\n");
printf("9-exit\n");
while(1)
{
printf("\nEnter the choice:");
scanf("%d",&choice);
switch(choice)
{
case 1:create();
break;
case 2:insertfront();
break;
case 3:insertAtanyposition();
break;
case 4:insertAtlast();
break;
case 5:deletefrombegining();
break;
case 6:deletefromanyposition();
break;
case 7:deletefromlast();
break;
case 8:display();
break;
case 9:exit(1);
break;
}
}
return 0;
}
}