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C identifier

Identifiers are name of variables, functions and arrays. These are user-defined names.

Identifier naming rules in C :

A.) First Character must be an alphabet (a-z or A-Z)

B.) Must consist of letters, digits or underscore.

C.) Cannot use reserved keywords

D.) Must not contain white spaces


int a123; Correct 

int a 123; wrong

C Compilers

Compiler:  Compiler is a computer program which transforms source code written in one programming language into another language (generally binary code,machine code ).

C compiler: C compiler converts C program into a binary program. (e.q. C compiler on windows compiles a C program and creates executable .exe file. )

Compilers for various platform / OS :

GCC ( Gnu C compiler ) : A open source C compiler for linux and other operating systems. GCC comes with preinstalled in ubuntu and other linux distribution. For windows we can install cygwin and Ming.

CodeBlocks with mingw for windows

Microsoft Visual studio for Windows

Turbo C++ for windows.