There are some examples which (IMHO) are not the best. First, global variables changed silently is a tempting yet very bad idea for software engineering. Yes,

There are some examples which (IMHO) are not the best. First, global variables changed silently is a tempting yet very bad idea for software engineering. Yes, we are used to them, but there are unsafe. You can easily create a mutable variable in the main, then explicitly change it with a function. So, no features are lost, but it enforces clarity and explicity. Second, I don't find initialization with zeros to be a huge problem. I got surprised it got mentioned at all.