Undoc'd Feature?

[toml_12953]

(07-09-2022 05:15 AM)Wes Loewer Wrote:  

(07-08-2022 08:32 PM)jte Wrote:  ... as C++17 introduces additional sequencing constraints involving assignment operators.

I tried the following on several different C/C++ compilers

Code:

int a=5;
a = a++;
printf("%d\n",a);

and they all printed out 5, except for the Microsoft compiler which prints 6. They all claim to be C++20 compliant, so somebody's wrong.

Is the combination of definition and assignment in one step new to C? The C interpreter in Casio calculators requires two steps:

int a;
a=5;