Using spaces Instead of tabs. You should always, always use tabs, not spaces.
Using tabs instead of spaces. You should always, always, use spaces.
Not using auto-formatting. Forget all that tabs/spaces rubbish, what’s wrong with you – auto-format your code and then people won’t have to look at your weird ideas about brackets anti spaces.
Using IDES, which have features such as auto-formatting and nicely-coloured buttons. code should be written in vi or Emacs, thus ensuring the purity of the programming experience.
Not using IDES. No-one wants to pay for the time it’s going to take you to type things that you could have done at the click of a button, or scroll up and down using some ridiculous key combination invoked using LISP
Failing to learn C and C++. It’s really important to learn the two absolute essential languages. You think Java is just as good? Fine, write me a real-time control system for racing cars in Java and I’ll believe you.
Learning C or C++ when you could be using something modern like Java instead. Admit it —all your schedules involving C or C++ overrun by five years. And even then the software turns out to have critical flaws that Java would not even have allowed you to create.