#include <stdio.h>
#include "mod.h"
void main(void)
{
	s_ochered ochered;
	ochered.begin=0;
	ochered.end=0;
	Menu (&ochered);
}

**************************************

struct student
{
	char name[100];
	int mark;
	student* next;
	student* prev;
};
struct s_ochered
{
	student* begin;
	student* end;
};
student* Get_Info (void);
student* Get_info_From_Txt (FILE*fp);
student* Get_info_From_Bin (FILE*fp);

void Add (s_ochered* ochered);
void Add_From_Txt (char* filename, s_ochered* ochered);
void Add_From_Bin (char* filename, s_ochered* ochered);

void Print (s_ochered* ochered);
void Print_To_Txt (char* filename, s_ochered* ochered);
void Print_To_Bin (char* filename, s_ochered* ochered);

void Delete (s_ochered* ochered);
void Banned_Delete (s_ochered* ochered);

void Clear (s_ochered* ochered);
void Menu (s_ochered* ochered);

**************************************

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include "mod.h"
student* Get_Info (void)
{
	student*s=(student*)malloc(sizeof(student));
	printf ("vvedite imya: ");
	scanf ("%s", &s->name);
	printf ("vvedite ocenku: ");
	scanf ("%d", &s->mark);
	return s;
}
student* Get_info_From_Txt (FILE*fp)
{
	student*s=(student*)malloc(sizeof(student));
	fscanf (fp, "%s ", &s->name);
	fscanf (fp, "%d ", &s->mark);
	return s;
}
student* Get_info_From_Bin (FILE*fp)
{
	student*s=(student*)malloc(sizeof(student));
	fread (s,sizeof(student),1, fp);
	return s;
}
void Add (s_ochered* ochered)
{
	student*s=Get_Info ();
	if (ochered->end==0 && ochered->begin==0)
	{
		ochered->end=s;
		ochered->begin=s;
		s->next=0;
		s->prev=0;
	}
	else
	{
		ochered->end->prev=s;
		s->next=ochered->end;
		s->prev=0;
		ochered->end=s;
	}
}
void Add_From_Txt (char* filename, s_ochered* ochered)
{
	FILE*fp=fopen(filename, "r");
	if (fp==0)
	{
		printf ("File not found\n");
		getch();
		exit (3);
	}
	while (feof(fp)==0)
	{
		student*s=Get_info_From_Txt (fp);
		if (ochered->end==0 && ochered->begin==0)
		{
			ochered->end=s;
			ochered->begin=s;
			s->next=0;
			s->prev=0;
		}
		else
		{
			ochered->end->prev=s;
			s->next=ochered->end;
			s->prev=0;
			ochered->end=s;
		}
	}
	fclose(fp);
}
void Add_From_Bin (char* filename, s_ochered* ochered)
{
	FILE*fp=fopen(filename, "rb");
	if (fp==0)
	{
		printf ("File not found\n");
		getch();
		exit (3);
	}
	while (feof(fp)==0)
	{

		student*s=Get_info_From_Bin (fp);
		if (ochered->end==0 && ochered->begin==0)
		{
			ochered->end=s;
			ochered->begin=s;
			s->next=0;
			s->prev=0;
		}
		else
		{
			ochered->end->prev=s;
			s->next=ochered->end;
			s->prev=0;
			ochered->end=s;
		}
	}
	Banned_Delete(ochered);
	fclose(fp);
}
void Delete (s_ochered* ochered)
{
	if (ochered->end==0 && ochered->begin==0)
	{
		printf ("ochered pusta\n");
		getch();
		exit(1);
	}
	else
		if (ochered->end==ochered->begin)
		{
			free (ochered->end);
			ochered->end=0;
			ochered->begin=0;
		}
		else
		{
			ochered->begin=ochered->begin->prev;
			free(ochered->begin->next);
			ochered->begin->next=0;
		}
}

void Banned_Delete (s_ochered* ochered)
{
	if (ochered->end==ochered->begin)
	{
		free (ochered->end);
		ochered->end=0;
		ochered->begin=0;
	}
	else
	{
		ochered->end=ochered->end->next;
		free(ochered->end->prev);
		ochered->end->prev=0;
	}
}
void Print (s_ochered* ochered)
{
	if(ochered->end==0 && ochered->begin==0)
		printf ("ochered pusta\n");
	while (ochered->end!=0 && ochered->begin!=0)
	{
		printf ("\nname: %s\nmark: %d", ochered->begin->name, ochered->begin->mark);
		Delete (ochered);
	}
}
void Print_To_Txt (char* filename, s_ochered* ochered)
{
	FILE* fp=fopen(filename, "w");
	if(ochered->end==0 && ochered->begin==0)
		printf ("\nOchered pusta\n");
	while (ochered->end!=0 && ochered->begin!=0)
	{
		fprintf (fp, "%s %d ", ochered->begin->name, ochered->begin->mark);
		Delete (ochered);
	}
	fclose(fp);
}
void Print_To_Bin (char* filename, s_ochered* ochered)
{
	FILE* fp=fopen(filename, "wb");
	if(ochered->end==0 && ochered->begin==0)
		printf ("\nOchered pusta\n");
	while (ochered->end!=0 && ochered->begin!=0)
	{
		fwrite(ochered->begin,sizeof(student),1, fp);
		Delete (ochered);
	}
	fclose(fp);
}
void Clear (s_ochered* ochered)
{
	while (ochered->end!=0 && ochered->begin!=0)
	{
		Delete (ochered);
	}
}
void Menu (s_ochered* ochered)
{
	int k;
re:	printf ("\nWhat do you want to do: \n1. Add elem\n2. Clear\n3. Print elem\n4. Exit\n");
	scanf ("%d", &k);
	switch(k)
	{
	case 1:
		printf ("\nAdd from: \n1. Keyboard\n2. Txt file\n3. Bin file\n");
		scanf ("%d",&k);
		switch(k)
		{
		case 1:
			Add (ochered);
			break;
		case 2:
			Add_From_Txt("data.txt",ochered);
			break;
		case 3:
			Add_From_Bin ("data.bin",ochered);
			break;
		}
		break;
	case 2:
		Clear(ochered);
		break;
	case 3:
	printf ("\nPrint to: \n1. Screen\n2. Txt file\n3. Bin file\n");
		scanf ("%d",&k);
		switch(k)
		{
		case 1:
			Print(ochered);
			break;
		case 2:
			Print_To_Txt("data.txt",ochered);
			break;
		case 3:
			Print_To_Bin("data.bin",ochered);
		}
		break;
	case 4:
		exit(2);
		break;
	default:
		printf ("\nWrong choose");
	}
	goto re;
}