Most of the operating systems are written in the C/C++ languages. These not only include Windows or Linux (the Linux kernel is almost entirely written in C), but also Google Chrome OS, RIM Blackberry OS 4.

Is Windows still written in C?

For those who care about such things: Many have asked whether Windows is written in C or C++. The answer is that – despite NT’s Object-Based design – like most OS’, Windows is almost entirely written in ‘C’.

Why are most OS written in C?

The vast majority of operating systems are written in C because C has a relatively simple run-time (it doesn’t require complex libraries just to meet the results of compiling the language), it can manage memory fairly explicitly, and it can do fairly arbitrary pointer and type casting.