[throwaway12245]

You'd have to delete your operating system and most of your libraries.

[pjmlp]

Thankfully not all OS are written in C, and many are making efforts to fix that mistake created by UNIX release into the industry.

Similarly, many managed compiled languages don't depend on C.

Finally, cybersecurity legislation will speed those efforts.

[kllrnohj]

Outside of the kernel it's a lot more C++ than C