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The growth of Unix in the C language made it exceptionally moveable and improvable.

The first version of Unix was written in the low-level PDP-7 assembler language. Soon after, a language called TMG was developed for the PDP-7 by R. M. McClure. Using TMG to develop a FORTRAN compiler, Ken Thompson instead ended up developing a compiler for a new high-level language he called B, based on the earlier BCPL language developed by Martin Richard. Where it might take numerous pages of complete PDP-7 assembly code to achieve a given task, the same functionality could characteristically be expressed in a higher level language like B in just a few lines. B was thereafter used for additional expansion of the UNIX system, which made the work much faster and more suitable.

When the PDP-11 computer inwards at Bell Labs, Dennis Ritchie built on B to create a new language called C which inborn Thompson's taste for brief sentence structure, and had a powerful mix of high-level functionality and the detailed features necessary to program an operating system. Most of the mechanism of Unix were ultimately rewritten in C, culminating with the kernel itself in 1973. Because of its expediency and power, C went on to become the most popular programming language in the world over the next quarter century.

This development of Unix in C had two important consequences:

  • Portability. It made it much easier to port Unix to newly developed computers, because it eliminated the need to translate the entire operating system to the new assemble language by hand:
    • First, write a C-to-assembly language compiler for the new machine.
    • Then use the new compiler to mechanically translate the Unix C language basis code into the new machine's assembly language.
    • Finally, write only a small amount of new code where absolutely required by hardware differences with the new machine.
  • Improvability. It made Unix easy to customize and improve by any programmer that could learn the high-level C programming language. Many did learn C, and went on to research with modifications to the operating system, producing many useful new extensions and enhancements.

Course Detail : C Programming

(1) Introduction to Programming (no of lecture - 1)

(2) Beginning with C Programming (no of lecture -1)

(3) Operators and Expressions (no of lecture - 4)

(4) Decision Making & Looping (no of lecture - 6)

(5) Array and Strings (no of lecture - 4)

(6) String and String handling Functions (no of lecture - 3)

(7) Functions (no of lecture - 4)

(8) Pointers (no of lecture - 2)

(9) Structures,Unions (no of lecture - 2)

  • Defining Structures and Structure variables
  • Accessing structure members
  • Initialization of Structures
  • Arrays and Structures
  • Structure within Structure
  • Structure with function
  • Unions

(10) File Management (no of lecture - 3)

  • File Management Functions
  • Opening and Closing Files
  • Read/Write Operations on files
  • Ramdom access of files
  • Standard I/O Vs. File I/O Functions
  • Command line Argumetns