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Dennis MacAlistair Ritchie (September 9, 1941 – c. October
12, 2011)[2][3][4][5] was an American computer scientist.[2] He created
the C programming language and, with long-time colleague Ken Thompson,
the Unix operating system and B programming language.[2] Ritchie and
Thompson were awarded the Turing Award from the ACM in 1983, the
Abecedario murale. Nuova ediz. Hamming Medal from the IEEE in 1990 and
the National Medal of Technology from President Bill Clinton in 1999.
Ritchie was the head of Lucent Technologies System Software Research
Department when he retired in 2007. He was the "R" in K&R C, and
commonly known by his username dmr.
Dennis Abecedario murale. Nuova ediz. Ritchie was born in
Bronxville, New York. His father was Alistair E. Ritchie, a longtime
Bell Labs scientist and co-author of The Design of Switching Circuits[6]
on switching circuit theory.[7] As a child, Dennis moved with his
family to Summit, New Jersey, where he graduated from Summit High
School.[8] He Abecedario murale. Nuova ediz. graduated from Harvard
University with degrees in physics and applied
mathematics.[7] After
receiving his bachelor's degree he decided with typical modesty that he
was not smart enough to be a physicist.[citation needed]
In 1967, Ritchie began working at the Bell Labs Computing
Sciences Research Center, and in 1968, he defended Abecedario murale.
Nuova ediz. his PhD thesis on "Program Structure and Computational
Complexity" at Harvard under the supervision of Patrick C. Fischer.
However, Ritchie never officially received his PhD degree as he did not
submit a bound copy of his dissertation to the Harvard library, a
requirement for the degree.[9] [10] In 2020, the Abecedario murale.
Nuova ediz. Computer History museum worked with Ritchie's family and
Fischer's family and found a copy of the lost dissertation.[11]
During the 1960s, Ritchie and Ken Thompson worked on the
Multics operating system at Bell Labs. Thompson then found an old PDP-7
machine and developed his own application programs and operating
Abecedario murale. Nuova ediz. system from scratch, aided by Ritchie and
others. In 1970, Brian Kernighan suggested the name "Unix", a pun on
the
name "Multics".[12] To supplement assembly language with a
system-level programming language, Thompson created B. Later, B was
replaced by C, created by Ritchie, who continued to contribute to the
development Abecedario murale. Nuova ediz. of Unix and C for many
years.[13]
During the 1970s, Ritchie collaborated with James Reeds and
Robert Morris on a ciphertext-only attack on the M-209 US cipher
machine that could solve messages of at least 2000–2500 letters.[14]
Ritchie relates that, after discussions with the NSA, the authors
decided not to Abecedario murale. Nuova ediz. publish it, as they were
told that the principle was applicable to machines still in use by
foreign governments.[14]
Ritchie was also involved with the development of the Plan 9 and Inferno operating systems, and the programming language Limbo.
As part of an AT&T restructuring in the mid-1990s,
Ritchie was Abecedario murale. Nuova ediz. transferred to Lucent
Technologies, where he retired in 2007 as head of System Software
Research Department.[15]
Ritchie is best known as the creator of the C programming language, a key
developer of the Unix operating system, and co-author of the book The C
Programming Language; he was the 'R' in Abecedario murale. Nuova ediz.
K&R (a common reference to the book's authors Kernighan and
Ritchie). Ritchie worked together with Ken Thompson, who is credited
with writing the original version of Unix; one of Ritchie's most
important contributions to Unix was its porting to different machines
and platforms.[16] They were so influential on Research Unix Abecedario
murale. Nuova ediz. that Doug McIlroy later wrote, "The names of Ritchie
and Thompson may safely be assumed to be attached to almost everything
not otherwise attributed."[17]
Ritchie liked to emphasize that he was just one member of a
group. He suggested that many of the improvements he introduced simply
"looked like a Abecedario murale. Nuova ediz. good thing to do," and
that anyone else in the same place at the same time might have done the
same thing.
Nowadays, the C language is widely used in application, operating system, and embedded system development, and its influence
is seen in most modern programming languages. C fundamentally changed
Abecedario murale. Nuova ediz. the way computer programs were written.
For the first time C enabled the same program to work on different
machines. Modern software is written using one of C's more evolved
dialects. Apple uses objective C, Microsoft uses C# and Java is the
choice of internet applications. Mr. Ritchie and Ken Abecedario murale.
Nuova ediz. Thompson used C to write UNIX. Unix has been influenti
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