Introduction of C

What is C?

Invented by Dennis Ritchie – AT&T Bell Labs

1972

Widely used today

Extends to newer system architectures

Efficiency/performance

Low-level access

C Features

Few keywords Structures, unions, compound data types.. Pointers, arrays… Standard library Compiles to native code Macro preprocessor

C Evolution

1972 – C Invention 1978 - 1st specification published 1989 - C89 standard ( ANSI C or standard C ) 1990 - ANSI C adopted by ISO, AKA C90 1999 - C99 standard

Not completely implemented in many compilers 2007 - Work on new standard C1X announced We will focus on ANSI/ISO C ( C89/C90 )

C Usage

Systems Programming

Operating systems

Microcontrollers Embedded processors DSP processors

Similarities of C to java

/* Comments */ Variable declarations if / else statements for loops while loops function definitions (like methods) Main function starts program

Differences between C and Java

C does not have objects There are “struct” ures

C is a functional programming language C allows pointer manipulation Input / Output with C

Output with printf function Input with scanf function

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