C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast


What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop


What is Function C User Defined Functions C Recursion C Passing Parameters


Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register


What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings


What is String C String Functions


What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer


What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def


What is Union


What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Extensions

In operating systems, a file name extension is an optional addition to the file name in a suffix of the form ".xyz" where "xyz" represents a limited number of alphanumeric characters depending on the operating system. The file name with extension allows a file's format to be described as part of its name so that users can quickly understand what type of file it is without having to (open).


  • .c stands for c file
  • .java stands for java file
  • .cpp stands for c++ file
  • .py stands for python file

Extensions in C Programming

Extensions in c

Source code file extension (.c)

Source code are versions before running of program by the compiler.

Header file extension (.h)

Header files contain predefined function declaration and various preprocessor statements. Header files allows source code to access externally defined function

Object code file extension (.obj or .o)

Object files are versions after running of program by the compiler. Object file consist of statements and function definition that are defined in binary form. Object files are not executable by themselves. In some operation system the file extension for Object file is .o, but in windows they often ends with .obj

Binary Executables file extension (.exe)

Binary Executables file produced as the output of the program called the linker. The linker link together a number of object files to produce a binary file that can be directly executed. In UNIX operating system Binary executable files does not have any extensions. In other operating system Binary Executables file have .exe as extension.

Report Us

We may make mistakes(spelling, program bug, typing mistake and etc.), So we have this container to collect mistakes. We highly respect your findings.


We to update you