1. History of C
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2. ‘C’ Language
● It is most popular language because
○ Structured Programming Language
○ High Level Language
○ Machine Independent Language or Portable
or Platform Independent
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3. History
● History of C and UNIX operating system
are intertwined
● Seeds of UNIX system began in 1965, at
MIT after the completion of project called
Project MAC
● MAC – It is was first time-sharing
computer systems
● MAC as joint with Bell Labs, began a
project called MULTICS (Multiplexed Information and
Computing Servies) www.eshikshak.co.in

4. Continue - History
● IBM had not yet built time-sharing into
their computers.
● Trio MIT, General Electric & Bell Labs
worked for a few years in 1969
● Bell Labs decided to discontinue the
project
● Ken Thompson and Dennis Ritchie smart
programmer were frustrated
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5. Continue - History
● They continue with project with an intense
“To develop a product that would simplfy
the dialog between human and machine.”
Thus named the project as UNIX
● PDP-7 machine was not eligible to start a
implementation of UNIX
● B language was used to develop the
UNIX system on GE -635 machine
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6. Continue - History
● Insufficient features of B Language
● B and BPCL Languages are typeless
● In 1971, Dennis Ritche decided to
improve B and BCPL
● He called it as NB “New B”, by adding
data type features
● Enhancement worked continue and
Dennis Ritchie graced it with a name ‘C’
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7. Continue - History
● UNIX Kernel was developed using ‘C’
Language
● It was provided to universities
● In 1980 it was most popular language and
its compiler were available for all the
platforms and machines
● American National Standard Institute
define ‘C’ Language
● In year 1989 ANSI C was released
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8. C History
● Developed between 1969 and 1973 along
with Unix
● Dennis Ritchie – Father of ‘C’
● Designed for systems programming
○ Operating systems
○ Utility programs
○ Compilers
○ Filters
● Evolved from B, which evolved from
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