addition

//program to calculate sum of two long integers using linked list
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


typedef struct node *nodeptr;
struct node{
int data;
nodeptr next;
};

list_print(nodeptr s)
   {

   if(s->next!=NULL)
   {

   list_print(s->next);
   printf("%d",s->data);
   }
   else{printf("%d",s->data);}

   }
list_print_str(nodeptr s)
   {

   while(s->next!=NULL)
   {
     printf("%d",s->data);
     s=s->next;
   }
   printf("%d",s->data);

   }
int num_list_add_leng(nodeptr s ,char str[])
{

 int len=strlen(str);

 int x=0;
 while(x<len)
 {
                int d=(int)str[x]-(int)'0';
                nodeptr temp=NULL;
                temp=malloc(sizeof(nodeptr));
                temp->next=s->next;
                s->next=temp;
                temp->data=d;
                x++;
 }
 return (len);

}
initialize(nodeptr one,nodeptr two,nodeptr ans)
{
    one->next=NULL;
    two->next=NULL;
    ans->next=NULL;
    one->data=0;
    two->data=0;
}
int bfr=0;



add(nodeptr one,nodeptr two,nodeptr ans)
{

    int ad1,ad2;
 while(1){

    if((one->next!=NULL)&&(two->next!=NULL))
    {
        one=one->next;
        ad1=one->data;
        two=two->next;
        ad2=two->data;
    }
    else{
    if((one->next==NULL)&&(two->next!=NULL))
    {

        ad1=0;
        two=two->next;
        ad2=two->data;

    }

    else{
    {
        ad2=0;
        one=one->next;
        ad1=one->data;

    }
    }
    }

    nodeptr temp=NULL;
    temp=malloc(sizeof(nodeptr));
    temp->next=ans->next;
    ans->next=temp;
    temp->data=(ad1+ad2+bfr)%10;
    bfr=(ad1+ad2+bfr)>9?1:0;
    if((one->next==NULL)&&(two->next==NULL))
    break;
    }
    if(bfr)
    {
    nodeptr temp=NULL;
    temp=malloc(sizeof(nodeptr));
    temp->next=ans->next;
    ans->next=temp;
    temp->data=1;

    }


}
main()
{
 nodeptr one=NULL;
 nodeptr two=NULL;
 nodeptr ans=NULL;
 one=malloc(sizeof(nodeptr));
 two=malloc(sizeof(nodeptr));
 ans=malloc(sizeof(nodeptr));
 initialize(one,two,ans);
 char a[10000];
 printf("first number ");
 scanf("%s",a);
 int l1=num_list_add_leng(one,a);
 printf("\n second number ");
 scanf("%s",a);
 int l2=num_list_add_leng(two,a);
 list_print(one->next);

 printf("\n");
 list_print(two->next);
 printf("\n");
 add(one,two,ans);
 list_print_str(ans->next);

}