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#include<conio.h>
#include<iostream.h>

struct List
{
	int data;
	List *next;			//A pointer to a list - will point to next list soon
};

void main()
{
	List *Pointer,*tail,*head;	//Pointer=what we access data with, tail is 1st list, head is last list
	Pointer=new List;		//Create a new List
	tail=Pointer;			//tail points to 1st List
	Pointer->data=5;		//Put some data into list 1 (first list)
	Pointer->next=new List;		//Make 1st lists pointer point to a new List (think logicaly, use paper example)
	Pointer=Pointer->next;		//Key line!  This makes pointer point to the 2nd list, so now we are in List 2
	Pointer->data=10;		//Put some data into list 2
	Pointer->next=new List;		//Create a 3rd List
	Pointer=Pointer->next;		//Point to 3rd list
	Pointer->data=15;		//Put some data into 3rd list
	Pointer->next=new List;		//Create a 4th list
	Pointer=Pointer->next;		//Point to 4th list, now we are inside list 4 with Pointer
	Pointer->data=20;		//Put some data into the 4th list
	Pointer->next=0;		//This is the last list, so make next = null or 0
	head=Pointer;			//Point to the head of the list - last one with head
	Pointer=tail;			//Go back to the start of the list again (list 1)
	while(Pointer->next!=0)		//while not at last list
	{
		cout << "Data is: " << Pointer->data << endl;	//Output lists data
		Pointer=Pointer->next;				//Go to next list - key line
	}
	cout << "Data is: " << Pointer->data << endl;	//Output final lists data, as the loop exits before the final list
	getch();
}

#include<conio.h>
#include<iostream.h>

struct List
{
	int data;
	List *next,*prev;			//Pointers to the next list and previous list
};

void main()
{
	List *Pointer,*temp;			//Pointer is where you are currently at (which carrage).
	int loop=0;
	Pointer=new List;			//Create 1st list
	Pointer->prev=0;			//No previous list, so set it to 0
	Pointer->data=5;			//Put some data into 1st list
	while(loop<5)
	{
		Pointer->next=new List;		//Create new list and point to it with next
		Pointer->next->prev=Pointer;	//Point prev back 1, - 2nd list onwards, ie: 2nd to 1st, 3rd to 2nd.....
		Pointer=Pointer->next;		//Walk over to the 2nd carrage(list), then 3rd, 4th...
		Pointer->data=(5*(loop+2));	//Put some data in the list - goes up in 5's - 5,10,15,20...etc;
		loop++;
	}
	Pointer->next=0;			//final carrage, so does not point to next one
	while(Pointer->prev!=0)
	{
		cout << "Data is: " << Pointer->data << " which was in carrage(list): " << (Pointer->data/5) << endl;
		temp=Pointer;			//Temp will be the hero who sacrafices himself to cut the last carrage off
		Pointer=Pointer->prev;		//Walk back up 1 carrage
		delete temp;			//Drop off last carrage(temp rolls away)
	}
	cout << "Data is: " << Pointer->data << "  which was in carrage(list): " << (Pointer->data/5);
	delete Pointer;				//Delete engine (1st list);
	getch();
}

#include<conio.h>
#include<iostream.h>
#include<fstream.h>

void main()
{
	int Age;
	cout << "Please enter your age: ";
	cin >> Age;
	ofstream Data("Data.txt");		//Create an instance of the file Data.
	Data << Age;				//Send some data to the file.
	Data.close();				//Remember to close the file.
	getch();
}

#include<conio.h>
#include<iostream.h>
#include<fstream.h>

void main()
{
	int Age;
	ifstream Data("Data.txt");		//Create an instance of the file Data.
	Data >> Age;				//Recieve an integer from the file.
	Data.close();				//Remember to close the file.
	cout << "Age: " << Age;
	getch();
}

#include<conio.h>
#include<iostream.h>
#include<fstream.h>

void main()
{
	int Number;
	char Key;
	ofstream Data("Data.txt",ios::app);			//Set up file, put new data at end of file
	cout << "Press Esc to exit or any key to continue." << endl;	
	Key=getch();
	while(Key!=27)
	{
		cout << "Please enter a number: ";
		cin >> Number;
		Data << Number << endl;				//Put number into file
		cout << "Press Esc to exit or any key to continue." << endl;
		Key=getch();
	}
	Data.close();
}

#include <conio.h>
#include <iostream.h>
#include <fstream.h>

void main()
{
	char Buffer[50];
	char Buffer2[50];
	int Size;					//String length (1 char = 1 byte)

	cout << "Type in some text: ";
	cin.getline(Buffer,50);
	Size = strlen(Buffer);

	ofstream Dataout("Data.bin",ios::binary);		//Put your text into the binary file
	Dataout.write((char *)Buffer,Size);
	Dataout.close();
	
	ifstream Datain("Data.bin",ios::binary);		//Read your text from the binary file
	Datain.read((char *)Buffer2,Size);
	Datain.close();

	cout << "\n\nYou typed in: " << Buffer2 << "\n\nPress any key to continue.";
	getch();
}

#include <conio.h>
#include <iostream.h>
#include <fstream.h>

void main()
{
	int Filesize;

	ifstream Data("Test.bin",ios::binary|ios::beg);
	if(Data.good())				//Check if file opened succesfully
	{
		Data.seekg(ios::end);			//Go to end of file
		Filesize = Data.tellg();		//Get how many bytes into the file we are
		Data.seekg(ios::beg);			//Go back to beggining of file
		Data.close();

		cout << "The file Test.bin is " << Filesize << " bytes.";
	}
	else
	{
		cout << "Error opening file Test.bin";
	}

	getch();
}