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Programming Language C

Team Badass. Programming Language C. History. Dennis M. Ritchie 1967 He became an employee at Bell Labs Mid 1960s BCPL was developed by Martin Richards for the Multics Project The B language was then developed by Ken Thompson for developing the UNIX system

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Programming Language C

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  1. Team Badass Programming Language C

  2. History • Dennis M. Ritchie • 1967 He became an employee at Bell Labs • Mid 1960s BCPL was developed by Martin Richards for the Multics Project • The B language was then developed by Ken Thompson for developing the UNIX system • 1971 Ritchie extended the B language and this was the first incarnation of C • 1973 UNIX was written in C

  3. Creation Rationale

  4. Faults with B • Dennis Ritchie worked with the language B before developing C. • The “UNIX community” mainly used B for programming. • Most didn’t like B because of its restrictions. • “Its character handling mechanism is awkward, floating-point arithmetic is not handled well, and there is too much overhead dealing with pointers.” • The biggest problem with this language was its typeless nature.

  5. New B • Dennis Ritchie wanted to improve B and so he started extending it. He had no intention of creating a new language at first. • One of the first things he did to extend the language was to add types to the language. The first extension of B included the two types Int, and Char. • This first extension had more “new” aspects to it other than the two variable types, but the typing was the most significant. • This extension of the language was called “New B”

  6. C • B was extended to such an extent that Ritchie finally decided that it was so different from B that it could now be considered a new language. • This new language was called C because it was the next letter in the alphabet after B. • There were 7 different variable types included in the C language by the time the first version released. • C is considered as a very portable language because it is easy to write compilers for the language for different systems.

  7. UNIX • In 1973 the UNIX kernel was rewritten in C by Dennis Ritchie. • When this happened, popularity for UNIX skyrocketed. • C made the UNIX system portable with most universities at the time because of C’s portability. • C gained a huge amount of popularity due to UNIX being written in the language. • It was so popular that there was a compiler for nearly every system available at the time.

  8. C Features • Programmer Oriented • Flexible • Portable • Efficiency

  9. C provides three ways to manage memory • Static memory allocation allocated at compile time before program is executed • Automatic memory allocation automatically allocates and de-allocates • Dynamic memory allocation uses blocks of memory to be used at run- time and released for reuse

  10. C was created because of the previous problems with the prior language B • Not only was there problems with the language itself, the compiler made it yield programs slower than assembly language • This led to the development of C which made for a more powerful, faster, and effective language • The C language and compiler allowed UNIX to be created which allowed multi-tasking and multi-user

  11. Pros and Cons

  12. Pros • Smaller package • Faster run-time • Its ability to communicate with assembly and communicate directly with controllers, processors and other devices. • High performance • Highly adaptable

  13. Cons • doesn’t have good type safety, which is the extent at which a program discourages typos. • Doesn’t have the versatility of its cousins. • Needs a C compiler • Requires more work in coding than other languages.

  14. Applications Involving C

  15. UNIX • Unix is an operating system • Multitasking was introduced • Portability • Customizable • Revolutionized computer programming

  16. Linux • Popular operating system • Based off of UNIX • Open source • Used heavily for programming • Many servers are ran by Linux

  17. id-tech Series • Extremely popular at the time and still is now • Also known as the “Doom engine” • Later changed language to C++ for stronger programming • Created games that revolutionized computer gaming forever. • For example games such as…

  18. Doom Series • Created by the company id Software • One of the first computer games that involved 3D graphics • Revolutionized first person shooters • Very memorable game

  19. HeXen Series • Another series created by id Software • Very similar game to Doom • Was not as popular as Doom or Wolfenstein 3D

  20. Quake • id-tech 1 upgraded to id-tech 2 and it was called the “Quake Engine” • First person shooters are based off of this very game. • TF2, Left 4 Dead, Counter Strike.

  21. MAME (Multiple Arcade Machine Emulator) • Allows recreation • Games are called “ROMs” • Currently written in C++, but was developed in C • Able to play any type of arcade game on a computer

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