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Is it true that Operating Systems like Windows, Linux and UNIX are written in C?

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Is it true that Operating Systems like Windows, Linux and UNIX are written in C?

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Major parts of popular operating systems like Windows, UNIX, Linux are still written in C. This is because even today when it comes to performance (speed of execution) nothing beats C. Also, the functions exposed by the Operating System API can be easily called through any language. Moreover, if one is to extend the operating system to work with new devices one needs to write Device Driver programs. These programs are exclusively written in C.

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