For sensors in vehicle in terms of speed.control what type of programming languages are better and secure ?

Answer 1

if you're implementing your speed control you'll need to read the speed value from the ODB2 connector in your car. To do this you can use an MCU. There are many tutorials regarding Arduino and ODB2 interfacing and that is surely the easiest way. To program your arduino you'll need c++.

Answer 2

@Madera sure?
http://forum.arduino.cc/index.php?topic=2249.0

I'm currently using OOP to implement a pseudo multitasking with millis(), to avoid using delay().
OOP is definitely not a C thing.

Answer 3

@seamiki Nope, arduino is programmed in C.