Jump to content


Photo

Learning Binary...


  • Please log in to reply
4 replies to this topic

#1 oO MOBILő£ –°HOR Oo

oO MOBILő£ –°HOR Oo

    I *Rock* this place

  • SHO's WindBags
  • 168 posts
  • Studying:Post Graduation
  • Country:India
  • Gender:Male

Posted 07 June 2008 - 12:35 PM

Introduction

Weíve all seen binary code. Weíve come to think of them as a bunch of ones and zeroes in long stringsÖ 010010101010101001101011

But these ones and zeroes can also represent decimal numbers. First off, I will show you how to read these numbers as the decimal numbers weíre used to in our daily life. Then, I will show you how to use those numbers and your keypad to translate them into text. Note that your computer doesnít use the decimal system, so technically, when it converts binary to text, it doesnít go through the process I will show you. This is just a divertive way of explaining you how the binary system works.

The Binary System

Basics

Letís think of the example above as empty slots:


First off, you read binary from right-to-left. Itís just the way itís designed. The first slot from the right represents a value of one, the second from the right a value of two, the third from the right a value of four, the fourth from the right a value of eight, the fifth from the right a value of sixteen, and the cycle continues by multiples of 2. This will never change.


By putting a 1 or a 0 in those slots you are either saying you want to corresponding value thatís attached to that slot or you donít. A 1 means yes, and a 0 means no. For example, putting a zero in the first slot from the right, but a 1 in the second slot from the right means you want a two, but not a one:

-------------------------------------------------

1 0

-------------------------------------------------

As such, the number above equals to a decimal value of two.


As an example, letís say you want to represent eight in binary form. Well, thinking about the slots, you want the first slot to be 0 because you donít want a one, you want the second slot to also be 0 because you donít want a two, you want the third slot to also to be 0 because you donít want a four, but you want the fifth slot to be 1 because you want a value of eight. As such, eight in binary form is:

-------------------------------------------------

1 0 0 0 (or simply 1000 without those underlines)

-------------------------------------------------

Now it is important to note that the amount of zeroes that precede the first value of one from the left is unimportant. So for example:

-------------------------------------------------

1 0 0 0 is the same as 0 0 0 1 0 0 0 (1000 = 000100)

-------------------------------------------------

To get it cleared up, hereís another example:

-------------------------------------------------

0 1 is the same as 1

-------------------------------------------------


Exercises

Question: What do the following equal in decimal terms?

a) 100

b) 000100

c) 100000

d) 0010

Answers:

a) 4

b) 4

c) 32

d) 2


More Binary!

If you got the answers above right, then you pretty much understand the basics of binary. Letís now understand how to get the corresponding decimal values to the numbers which are not multiples of 2.


To get the total value of a binary number, add the values corresponding to each slot. So, for example, three in binary would be:

----------------------------------------------------

11

----------------------------------------------------

The above corresponds to three because if you add the total values of all the slots, that is to say a one from the slot to the right, and a two from the second slot to the right, then it equals three.


As another example, letís say you want to represent 5 in binary terms. Then you would need a value of one to be added to a value of four, and you would not want a value of two:

---------------------------------------------------

101 [Reading from the right: 1(one) + 0(two) + 1(four) = five]

---------------------------------------------------

Hereís an additional example:

---------------------------------------------------

001011 [Reading from the right: 1(one) + 1(two) + 0(four)
+ 1(eight) + 0(sixteen) + 0(thirty-two) = eleven)

---------------------------------------------------

Exercises

Question: What do the following equal in decimal terms?

a) 11011

b) 110

c) 010101

d) 10110

Answers:

a) 27

b) 6

c) 21

d) 22


If you got the above questions correct [without cheating], then you essentially understand the binary system. Understanding the binary system was the hard part. What follows is pretty easy.


Converting Binary to ASCII (Text)

Basics

ASCII is essentially the letters, numbers and symbols that are stored in our computers through the use of fonts. When the keyboard relays the buttons you pressed, it sends in a code which is then converted to the ASCII equivalent of ďkĒ or ď5Ē or whatever key you pressed.

Hereís an example of a message ďhiddenĒ in binary text:

---------------------------------------------------------

0100100001100101011011000110110001101111

---------------------------------------------------------

Now there are only so many letters, numbers and symbols stored for ASCII. Having sets of 8 digits for their binary equivalent is more than enough to represent all of these letters and the like. As such, all strings that represent text like in the above are separated into bits of 8 for simplicity:


----------------------------------------------------------

01001000 01100101 01101100 01101100 01101111

----------------------------------------------------------

Okay, so our example message was separated into 8 digit strings. The decimal value for each of these strings in the example was calculated for you.


----------------------------------------------------------

01001000 = 72
01100101 = 101
01101100 = 108
01101100 = 108
01101111 = 111

----------------------------------------------------------

The result was 72,101,108,108,111. Now, there is something called the ASCII table. It essentially corresponds to the binary numbers from yore to the equivalent letters/symbols/numbers. But since we found the decimal values of these binary strings, we can use a major shortcut.


By pressing ALT + [The Number], you will get the ASCII equivalent of that number. For example, by pressing the ALT key and at then (while keeping it down) the numbers 72 in any text editor, you will get the corresponding ďHĒ to show up.


Letís do so for the entire example message:

-----------------------------------------------------

72 = H
101 = e
108 = l
108 = l
111 = o

-----------------------------------------------------

So the entire ďhiddenĒ message translates to ďHelloĒ.

Excercise

Question: Decode the following message

01000011011011110110111001100111011100100110000101 11010001110
10101101100011000010111010001101001011011110110111 00111001100100001


Hint: The first step on your way to decoding the message (separated into bytes for you)

---------------------------------------------------------

01000011 01101111 01101110 01100111 01110010
01100001 01110100 01110101 01101100 01100001
01110100 01101001 01101111 01101110 01110011
00100001

---------------------------------------------------------



PPL this is de only way I can put it into ur brains if dis doesn't work, change ur parts


#2 InTlo_iNtAlEcTuAl

InTlo_iNtAlEcTuAl

    VIP

  • SHOs Rockers
  • 1,493 posts
  • College:Anurag Engieering College
  • Studying:Graduation
  • Country:India
  • Gender:Male

Posted 09 June 2008 - 07:26 PM

every body has learned that dude

#3 harsha_mic

harsha_mic

    I'm more a Student here

  • Naughty Student
  • 385 posts
  • Studying:Working
  • Country:India
  • Gender:Male

Posted 01 July 2008 - 06:07 AM

it is very good

#4 sweetr

sweetr

    I m here to gather info

  • SHO Lovers
  • 52 posts
  • Country:India
  • Gender:Female

Posted 29 September 2008 - 10:47 AM

thants relly good

#5 nand998

nand998

    Noobs

  • Shos newbie
  • 8 posts
  • Country:India
  • Gender:Male

Posted 29 September 2008 - 05:48 PM

Good Explanation




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users