Wrong result with enum
stanislav.blinov at gmail.com
Thu Nov 11 14:52:45 UTC 2021
On Thursday, 11 November 2021 at 09:11:37 UTC, Salih Dincer wrote:
>> Unless explicitly set, default type is int. 10000100000 is
>> greater than int.max.
> enum w = 100_000;
> size_t b = w * w;
> // size_t b = 100000 * 100000; // ???
> assert(b == 10_000_000_000); // Assert Failure
> The w!(int) is not greater than the b!(size_t)...
That code is
size_t b = int(w) * int(w);
That is, `multiply two ints and assign result to a size_t`.
Multiplication of two ints is still an int though, and you can't
fit ten billion in an int, so that's overflow. It doesn't matter
that you declare `b` as `size_t` here. Overflow happens before
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