Undoc'd Feature?

[Wes Loewer]

(07-31-2022 02:12 AM)jte Wrote:  [quote='Wes Loewer' pid='162310' dateline='1658063144']

Code:

a = 5;
a = 1000*a++ + 100*a++ + 10*a++;  // undefined expression.

Note: Since this is undefined, there is no guarantee that the results are indicative of the results a compiler would produce in a defined case, but it does suggest what a compiler might be doing. That said, here are some results:

gcc/clang/intel all print 5670

Just for fun, I installed my old MS Quick C 2.51 from 1990 in DOSBox. It produces 7650.