Discussion @ 1223. Chernobyl’ Eagle on a Roof @ Timus Online Judge

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Discussion of Problem 1223. Chernobyl’ Eagle on a Roof

return fabs(Temp-floor(Temp))<1e-3;

Can anybody explain, why
return fabs(Temp-floor(Temp))<1e-3;
causes WA on test 3

and
return Temp == floor(Temp);
got AC

????