#include<stdio.h>
#include<conio.h>
#include<string.h>
#define FALSE 0;
#define TRUE 1;

typedef char string10[11];
typedef char string20[21];

struct CustRec{
string10 Name;
string20 Address;
struct CustRec *Prev, *Next;
};

typedef struct CustRec *CustPtr;

CustPtr FirstCust, LastCust, PrevCust, CurrentCust;

void AddRecord(string10 N, string20 A)
{
    if(FirstCust == NULL){
    CurrentCust = malloc(sizeof(struct CustRec));
    strcpy(CurrentCust->Name,N);
    strcpy(CurrentCust->Address,A);
    CurrentCust->Next = NULL;
    CurrentCust->Prev = NULL;
    FirstCust = CurrentCust;
    LastCust = CurrentCust;
    }
    else {

    PrevCust = LastCust;
    CurrentCust = malloc(sizeof(struct CustRec));
    strcpy(CurrentCust->Name,N);
    strcpy(CurrentCust->Address,A);
    PrevCust->Next = CurrentCust;
    CurrentCust->Next = NULL;
    CurrentCust->Prev = PrevCust;
    LastCust = CurrentCust;
    }

    }


void ListForwards(void)
{
    CurrentCust = FirstCust;
    while (CurrentCust !=NULL)
    {
     printf("Name : %s\n",CurrentCust->Name);
     printf("Address : %s\n",CurrentCust->Address);
     CurrentCust = CurrentCust->Next;
    }
    printf("\n");
}

void ListBackwards(void)
{
CurrentCust = LastCust;
while (CurrentCust !=NULL) {
printf("Name : %s\n", CurrentCust->Name);
printf("Address : %s\n", CurrentCust->Address);
CurrentCust = CurrentCust->Prev;
}
printf("\n");
}// ListBackwards ends here.

void DEL
{
     ???????
     ???????
     ???????
     ??????
     ??????
}

int main(void)
{
FirstCust = NULL;
LastCust = NULL;
PrevCust = NULL;
CurrentCust = NULL;
AddRecord("Bernil","Ecoland");
AddRecord("Andrei","Nova Tierra");
AddRecord("Loresh","Central Park");
AddRecord("Carinna","Ladislawa");
AddRecord("Jovan","Woodridge");

ListForwards();
ListBackwards();
ListForwards();
getch();
}

int del(CustRec cr)
{
  if (cr != null)
   return free(cr);
  return 1;
}

#include <stdlib.h>
#include <memory.h>
#include <string.h>

...

char* str;

str = malloc(strlen("Hello world!")); /* Allocate memory to str. */
strcpy(str, "Hello world!");

printf("%s\n", str);

free(str); /* Free up the memory used by str. */