Thread: Help with linked list

Hi!

I have problem with the "ReadList" and "WriteList" function.

Code:

# include <stdio.h>
# include <stdlib.h>
# include <ctype.h>
# include <conio.h>

# define FALSE 0

typedef struct 
{  
	int Value;
	struct List *link;
} List;

// other functions
void clrscr (void);
void Menu (int *Choose);
// functions for the list
List *AddElement (List *start, int Data);
void ReadList (List *start, char File01[]);
void WriteList (List *start, char File01[]);
void PrintList (List *start);

int main()
{
	int Choose, Data;
	List *start = NULL;
               
	start = ReadList(start, "data.txt");
	do
	{
		Menu(&Choose);
		switch (Choose)
		{
			case 1:
				printf("\nEnter number: ");
				scanf("%d", &Data);
				start = AddElement(start, Data); 
				break;
			case 2:
				if (start != NULL)
				{
					PrintList(start);
				}
				else
				{
					printf("\nList is empty.");
				}
				getch();
				break;
			case 3:
				break;
			default:
				printf("\nWrong selection. Try again.");
				getch();
				break;
		}
	} while (Choose != 3);
                WriteList (start, "data.txt");
	return 0;	
}

void Menu (int *Choose) 
{
    unsigned char Char;

    do 
	{
		clrscr();
		printf("List");
		printf("\n\n1 - Add element into sorted list");
		printf("\n2 - Print elements on the screen");
		printf("\n3 - Exit");
		printf("\n\nChoose: ");
		Char = getchar();
		if ((isdigit (Char) == FALSE) && (Char != '\n')) 
		{
			printf ("\nYou must enter number."); getch();
		}
    } while (isdigit (Char) == FALSE);
    *Choose = (int) Char - '0'; 
}

void clrscr()
{
	system("cls");
}

List *AddElement (List *start, int Data)
{
	List *pom, *New;
	
	New = (List *) malloc(sizeof(List));
	New->Value = Data;
	if ( (start == NULL) || (New->Value <= start->Value) ) 
	{
		(List *)New->link = start;
		start = New;
	}
	else
	{
		pom = start;	
		while ( (pom->link != NULL) && (New->Value > ((List *)pom->link)->Value) )
		{
			pom = (List *)pom->link;
		}
		New->link = pom->link;
		(List *)pom->link = New;
		
	}
	return start;
}

void PrintList (List *start)
{
	while (start != NULL)
	{
		printf("%d\t", start->Value);
		start = (List *)start->link;
	}
}

Thnx in advance .