INTRODUCTION TO C PROGRAMMING LANGUAGE

C ? 

• C is a programming language.
• Developed at AT &T’s Bell Laboratories of USA in 1972.
•  It was designed and written by Dennis Ritchie.

Versions of ‘C’

• K & R C
•  ANSI C
•  ISO C
•  ISO 9899
•  C99

First Edition of ‘C’

•  In 1978, the first edition of Kernighan and Ritchie's The C  Programming Language was published.
•  It introduced the following features to the existing versions of  C
•  structure data type
•  long int data type
•  unsigned int data type
• The += operator

C Programming Tutorial-Dennis Ritchie

ANSI C

In 1989, C was first officially standardized by ANSI standards committees also included following new features

1.  functions returning struct or union
2.  void * data type
3.  const qualifier to make an object Read Only
4.  assignment for struct data types

ISO 9899

•  The ANSI C standard, with a few minor modifications, was adopted as ISO standard number ISO 9899. 
• The first ISO edition of this document was published in 1990(ISO 9899:1990)
• ISO 9899:1999, which was published in 1999 is commonly referred to as "C99". 
• It was adopted as an ANSI standard in March 2000.

New features in C99

• Inline functions
• Freeing of restrictions on the location of variable declarations 
• The addition of several new data types, including long long int
• An explicit Boolean data type
• Official support for comments beginning with “// ” as in C++
• Several new library functions and Header files