Mobile Apps & Operating Systems

Question

What are the languages to learn to help make mobile apps and Operating Systems?

Answer 1

You can try C, linux and maybe windows kernel are also written in C/C++

Answer 2

I know that C# is also possible, but don't know if it is the best for android.

Answer 3

Android apps are made with java

Answer 4

for both android & ios

Answer 5

Android i think still using C
But ios i'm not sure but i think it using objective-c