The fact that you were successful because the guy who sat next to you in class knew how to unlock the programming mode of your calculator is incidental. Why did

The fact that you were successful because the guy who sat next to you in class knew how to unlock the programming mode of your calculator is incidental. Why didn't your teacher do it? Congratulations on escaping the system that disadvantaged you. The best thing about programming is that it defines a notation for doing mathematics that doesn't trigger people who went to public schools. Be careful about calling yourself a professional software engineer. In many places you can be sent to jail for claiming any two out of the three words in that title.