Nah, bro this doesn't exist in standard C++. Don't use it. It's a bad idea to use gnu extensions.

@MikChan

happy you liked it!

I am not a huge C++ player, so it just didn't occur to me to use std::array<std::string, 12>.

TIL

Vandalised a bit and merged.

Shrinks the code a bit.

Approved

Issues with the description:

1. it is not defined to what grammar rule the input string conforms. Typically it's the first rule, but that's clearly not the case.
2. for evaluation, "the PEMDAS rule is applied", however that one is ambiguous for order of division; a/b/c can mean either a/(b/c) or (a/b)/c

Approved.

This looks like a really fun concept, but I feel like I've done a kata like this before...

If not, I want to translate it into other languages

One way to check if it's reasonable is to evaluate your version of the expresion and check for floating-point errors with errno or the floating point state

See https://en.cppreference.com/w/cpp/numeric/math/math_errhandling.html

Also, you can estimate the error caused by a small deviation using the derivative, which you should already have

just perfect.

bruh ill never become a programmer

approved