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4 character encoding-ascii

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4 character encoding-ascii

  1. 1. ASCII • It stands for American Standard Code for Information Interchange • ASCII is a character encoding based on the English alphabet. • It is an ANSI (American National Standards Institute) standard • It defines codes for 128 characters: – 33 are non-printing, mostly obsolete control characters that affect how text is processed – 95 are printable characters
  2. 2. ASCII • ASCII is a seven-bit code, meaning it uses patterns of seven binary digits (a range of 0 to 127 decimal) to represent each character. – When ASCII was introduced, many computers used eight-bit bytes as the native data type. The eighth bit was commonly used as a parity bit for error checking on communication lines 0 1 0 0 0 0 0 1
  3. 3. ASCII • Different versions of ASCII were created for different applications – Windows-1252 - Changed some of the character encodings – Mac OS Roman - Extended the encoding beyond 7 bits (the 7-bit characters were the same)
  4. 4. ASCII
  5. 5. ASCII • The good – Encode all characters in 1 byte – Almost every computer supports/supported ASCII • The bad – Can only encode English (with a limited number of accented characters)

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