Character Data Type

1
Character Data Type
char x A // single character char msg1
Hello // character string String msg2
Howdy // String data type
Images were taken from Wikipedia
2
Character Coding
EBCDIC Extended Coded Decimal Interchange Code
(8-bit) ASCII American Standard Code for
Information Interchange (7-bit) Unicode
Character set for almost all international
characters (16-bit)
3
EBCDIC Character Set
Hollerith punched cards
For more information, see http//en.wikipedia.org/
wiki/Punched_card
4
ASCII Character Set
Teletype punched paper tape
For more information, see http//en.wikipedia.org/
wiki/Paper_tape
5
ASCII Character Set
6
ASCII Character Set
7
ASCII Character Set
8
ASCII Character Set
9
Unicode Character Set

• An extension of ASCII
• 16 bits give 65,536 possible character
  combinations
• Includes characters from all major languages of
  the world
• If the first byte is zero, then the second byte
  is an ASCII character

10
Characters vs. Strings
char single character, represented with single
quotes A String array of characters
terminated by a NULL byte, represented with
double quotes Hello
11
Pascal vs. C Strings
Pascal string
C-string
12
String Manipulation

• length
• NULL string
• concatenate
• substring
• parse

• search
• creation
• duplication
• comparison
• change case

13
THE END