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).

Example

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

Extensions in C Programming

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.