a program to merge two sorted linked list

#include<stdio.h>
#include<conio.h>
#include<alloc.h>

typedef struct linked
{
int val;
struct linked *next;
}lnk;

lnk *create();
lnk *merge(lnk *,lnk *);
void disp(lnk *);

void main()
{
lnk *h1,*h2,*h;

printf("\n\nEnter the values (0 to exit) : ");
h1=create();

printf("\n\nEnter the values (0 to exit) : ");
h2=create();

printf("\n\nValues in the first linked list are : ");
disp(h1);

printf("\n\nValues in the second linked list are : ");
disp(h2);

h=merge(h1,h2);
printf("\n\nValues in the merged linked list are : ");
disp(h);

getch();

}

lnk *create()
{
lnk *temp,*ptr,*h=NULL;
int v;

while(1)
{
scanf("%d",&v);

if(v==0)
return h;

temp=(lnk*)malloc(sizeof(lnk));
temp->val=v;
temp->next=NULL;
if(h==NULL)
h=temp;
else
ptr->next=temp;
ptr=temp;
}
}

void disp(lnk *h)
{
while(h!=NULL)
{
printf("%d",h->val);
h=h->next;
}
}

lnk *merge(lnk *h1,lnk *h2)
{
lnk *h=NULL,*temp,*ptr;

while(h1!=NULL && h2!=NULL)
{
if(h1->val<h2->val)
{
temp=h1;
h1=h1->next;
}
else if(h2->val<h1->val)
{
temp=h2;
h2=h2->next;
}
else
{
temp=h1;
h1=h1->next;
h2=h2->next;
}

if(h==NULL)
h=temp;
else
ptr->next=temp;

ptr=temp;
}
if(h1!=NULL && h2==NULL)
ptr->next=h1;

if(h2!=NULL && h1==NULL)
ptr->next=h2;

return h;

}