[cellularmitosis]

> It's not operator precedence—that's a separate issue

> It's even mnemonic—when the increment symbol goes before the thing being incremented, the increment happens first; else after—but even if not, it's a fairly basic language feature.

I think you missed the issue.

This is 100% about operator precedence, and has nothing to do with the decrement operator being in front of or behind the variable.

This expression:

    *stack--

means either this:

    (*stack)--

or this:

    *(stack--)

depending on the operator precedence rules.

If this is the layout of memory:

             ~~~~~~
    stack-1: | 52 |
    stack:   | 23 |
    stack+1: | 19 |
             ~~~~~~

(* stack)-- evaluates to 22, while *(stack--) evaluates to 52.

https://godbolt.org/z/P7Ghfc

[moonchild]

> operator precedence

Right, yes. I got confused by your example, because the example is definitely about pre- vs post-increment. My point about idioms still stands, though.

> (* stack)-- evaluates to 22, while * (stack--) evaluates to 52.

Actually, (* stack)-- evaluates to 23, but changes *stack to 22 :)

[cellularmitosis]

> Actually, (* stack)-- evaluates to 23, but changes *stack to 22 :)

Thanks, I just realized I had that wrong :) https://pastebin.com/n7sHzW3p