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Representing Characters in Memory

  • The data in a computer are not recognized with the help of alphabets.
  • To represent the data there are many code representation available.
  • These codes are called alphanumeric codes.
  • It has 26 lower case characters, 25 uppercase characters, 10 digits, 7 punctuation marks and anywhere from 20 to 40 other characters.
  • The various code formats available are
    • ASCII (American Standard code for information interchange)
    • ISCII ( Indian Script Code for Information interchange)
    • Unicode
ASCII (American Standard Code for Information Interchange)
  • It is used microcomputers and minicomputers.
  • It is a 7 bit code and so it has 27 = 128 possible code groups.
  • The following table shows the listing of ASCII code


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