link-problem.c

#include <stdio.h>
#include <stdlib.h>
void insert_at_end();
struct node{
    int data;
    struct node *link;
};
int main()
{
    struct node *head=malloc(sizeof(struct node));
    struct node *ptr=malloc(sizeof(struct node));
    struct node *pr=malloc(sizeof(struct node));
    head->data=45;
    head->link=ptr;
    ptr->data=50;
    ptr->link=pr;
    pr->data=55;
    pr->link=NULL;
    while(head!=NULL)
    {
        printf("->%d",head->data);
        head=head->link;
    }
    insert_at_end(head,60);
    struct node *ptnr=head;
    while(ptnr!=NULL)
    {
        printf("->%d",ptnr->data);
        ptnr=ptnr->link;
    }
}
void insert_at_end(struct node *head, int data)
{
    struct node *pnt,*temp;
    pnt=head;
    temp->data=60;
    temp->link=NULL;
    while(pnt->link != NULL)
    {
        pnt=pnt->link;
    }
    pnt->link= temp;
}