Best OBD2 Scanners

[elekala]

What is the output of this program and Explain the logic?
How to find the best obd2 scanner for the money? I have used hundreds of obd2 scanner, and I know which one is the best. My top favorite scanner brand is Autel. I have listed top-rated obd2 scanners list here https://bestobd2scanners.com/ . But the real question arises that how this scanner program work?

Actually, I am thinking to develop an obd2 scanner and want manufacture as well. So, I need to know how obd2 scanner work and which language program is efficient to develop it.

I don't have an idea about program language. I hope someone gives me some guidance on how this work. Even, I am not sure it is the right forum or not.

So, again, my question is "how to develop best obd2 scanner" and where can I find a good developer who can help me out to do that?

[salem c]

Are you sitting in an exam at the moment, and unable to use a compiler?

Because you could have tried it in less time than it took to register on a forum and try it.

The output I get is an error message.

$ g++ -Wall foo.cpp
foo.cpp:16:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type]
 main() {
      ^