Why when I write noexcept before const i get an error

Question

Why when I write definition of a class member function such as

int returnSize() const noexcept

the code compiles, but when I write

int returnSize() noexcept const

it doesn't compile

Answer 1

That's just the way the language is defined.

Exception specifiers need to come after const/volatile qualification: https://en.cppreference.com/w/cpp/language/function