What is the best language to program embeded systems and controlling machines?

Answer 1

C and ASM for whatever instruction set you wish to target. Good luck.

Answer 2

c++ can't do this? ??

Answer 3

It is not a case if C++ can do it, but rather if there is a C++ compiler available for the target processor of your embedded system.

For example for systems based on RasberryPi C++ will be fine, since they run a flavour of Linux so GCC is available. On the other hand for many (most?) embedded controllers only a C compiler is available, so John Virgo's answer is correct since this is the more common case.

IIRC the compiler for Arduino is a kind of hybrid C/C++, but I am not familiar with it. (Any Arduino enthusiasts that want to comment?)

C is still the "lingua franca" of the embedded world.