Linked list

#include <stdio.h>
#include <stdlib.h>
struct node
{
    int id;
    double prize;
    struct node *next;
}*start=NULL;
void cre()
{
    struct node *c,*n;
    int a,i;
    printf("Enter book number:\n");
    scanf("%d",&a);
    for(i=0;i<a;i++)
    {
        n=(struct node*)malloc(sizeof(struct node));
        printf("Enter book id:\n");
        scanf("%d",&n->id);
        printf("Enter book prize\n");
        scanf("%lf",&n->prize);
        n->next=NULL;
        if(start == NULL)
        {
            start=n;
            c=n;
        }
        else
        {
            c->next = n;
            c=n;
        }

    }

}
void dis()
{
    struct node *c;
    c=start;
    while(c!=NULL)
          {
              printf("Id-->%d-->%.1lf-->",c->id,c->prize);
              c=c->next;
          }
          printf("NULL");
}
void max()
{
    struct node *c;
    c=start;
    double max=0;
    while(c!=NULL)
    {
        if(max<c->prize)
        {
            max=c->prize;
        }
        c=c->next;
    }
    printf("\nHighest prize is %.1lf\n",max);
}
int main()
{
    cre();
    dis();
    max();
}