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About C Files

A .c file contains program instructions written in the C programming language that perform calculations, process data, interact with the operating system, or control how an application operates. The C file may contain functions, variables, statements, and other programming elements that developers can edit as plain text. Although the .c extension is most commonly associated with C, some C++ development environments may also use C files for source code that follows C++ syntax or can be compiled as C++.

The C programming language was developed in the 1970s and became widely used for developing operating systems, utilities, embedded software, applications, and other performance-sensitive programs. Developers have used C files with compilers and development environments on platforms ranging from Unix and Linux systems to Windows and embedded devices. Today, you may encounter C files when maintaining existing software, studying programming, working with open-source projects, developing system software, or programming hardware and embedded devices.

You can open and view the contents of a C file with a source code editor or plain text editor because it is stored as readable text. However, to compile the code into a program, you generally need a compatible C compiler or development environment.