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devel / comp.lang.c++ / MAX * MAX == MAX

MAX * MAX == MAX

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From: Bonita.Montero@gmail.com (Bonita Montero)
Newsgroups: comp.lang.c++
Subject: MAX * MAX == MAX
Date: Mon, 22 Apr 2024 17:11:31 +0200
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by: Bonita Montero - Mon, 22 Apr 2024 15:11 UTC

Not really surprising, but funny.

#include <iostream>
#include <cfenv>
#include <limits>

using namespace std;

int main()
{ static pair<char const *, int> const rounds[] =
{
{ "to nearest", FE_TONEAREST },
{ "downwards", FE_DOWNWARD },
{ "upwards", FE_UPWARD },
{ "towards zero", FE_TOWARDZERO }
};
double volatile max = numeric_limits<double>::max();
for( auto round : rounds )
{
fesetround( round.second );
cout << round.first << ": " << max * max << endl;
}

}