Working with text ASCII and UNICODE.  0 1 1 0 0 0 0 1  0 1 0 0 0 0 0 1  0 0 1 1 0 0 0 0.

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Presentation transcript:

Working with text ASCII and UNICODE

  

From the CAS curriculum KEY STAGE 3  Representations of:  Unsigned integers  Text. [Key point: each character is represented by a bit pattern. Meaning is by convention only. Examples: Morse code, ASCII.]  Sounds [both involving analogue to digital conversion, e.g. WAV, and free of such conversion, e.g. MIDI]  Pictures [e.g. bitmap] and video.  Many different things may share the same representation, or “the meaning of a bit pattern is in the eye of the beholder” *e.g. the same bits could be interpreted as a BMP file or a spreadsheet file; an 8-bit value could be interpreted as a character or as a number].

Today’s session 5:00 – 6:00 Computers and text 6.00 – 7.00 Programming in Scratch

Encoding and decoding See Boston University CS101 presentation – go to first lecture (whole series is good!) Boston University CS101 presentation An excellent introduction to Computer Science and what a bit pattern might mean

Text?

Sound?

Image?

Text Data  Are sets of characters  Characters could be letters, digits, symbols (£, &),  Telephone numbers are text data (should be encoded as text)

Morse Code  Morse code is one kind of coding system for text  Try these activities: code.php Lki3jxNLVCI /keeping-secrets/codes-and-code- breaking.aspx

ASCII code – another coding system for text. Used by computers space A a ! B b " C c £ D d $ E e % F f & G g ' H h ( I i ) J j * : K k Note how the codes for A.. Z, a.. Z and are sequences

ASCII & Unicode  ASCII uses 7 bits to encode characters  Extended ASCII uses 8 bits  Unicode uses 8, 16 or 32 bits and is usually shown in Hex. 16 bits is the most common system used.

ASCII codes are a subset of Unicode Unicode uses the same code for A

Explore the ASCII codes using the Insert Symbol option in MS Word What different alphabets are there? Note the character code can’t be represented in 1 byte

Now try…  James Robinson’s Binary Messaging System James Robinson’s Binary Messaging System  Can you create your name in ASCII?  Good for binary practice as well as understanding ASCII coding