I guess you mean operating system written in C language. Two examples: Unix (and derivatives), MS Windows.
The operating system on a computer is installed on your hard drive, usually under c:
The operating system on a computer is installed on your hard drive, usually under c:
C and C++ are not directly supported by operating systems. You must use a compiler to convert a program written in C or C++ to a native executable that runs under a particular operating system. In other words, you can use C or C++ under any operating system for which a compiler exists for the desired language.
An operating system is a program that can be written in C
Unix.
The Unix operating system. The first versions of the Unix operating system were written in the "B" language, and later written in "C", which was invented in order to develop Unix on the PDP-11 machine.
Android is an operating system made by Google for cell phones. It is the operating system of the popular Motorola Droid. It is programmed in the C++ programming language, and is Unix based.
C/C++ is used to write system softwares. The whole of UNIX operating system is written in C language.
In a Windows environment, the operating system is located on the C drive in the system folders. It can be manually installed somewhere else if desired.
Format drive C
MS-DOS.
If your Windows operating system is not installed on drive C, you can simply format using the inbuilt formatting tool. Otherwise, you need to boot your computer using an operating system on different drive to format C.