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| Re: OT: Can someone explain this? [message #183334 is a reply to message #183221] |
Fri, 23 December 2005 12:30   |
=HT=T-Bird
Messages: 712
Registered: June 2005
Karma: 0
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Colonel |
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Mathematics assumes that numbers have infinite precision. However, that's not possible with computers that use floating-point arithmetic, so you get round-off that gives you really tiny numbers instead of 0. Example of the WRONG way to do things (in C++):
float f1 = 2.0 - 1.0;
float f2 = 1.0;
if (f1 == f2)
std::cout << "this might not happen";
else
std::cout << "oops...floating point round-off";
(I still haven't figured out how to insert tabs in forum posts  )
and the RIGHT way:
float f1 = 2.0 - 1.0;
float f2 = 1.0;
if (std::fabs (f1 - f2) < std::numeric_limits <float>::epsilion ())
std::cout << "this works";
I hope this helps
HTT-Bird (IRC)
HTTBird (WOL)
Proud HazTeam Lieutenant.
BlackIntel Coder & Moderator.
If you have trouble running BIATCH on your FDS, have some questions about a BIATCH message or log entry, or think that BIATCH spit out a false positive, PLEASE contact the BlackIntel coding team and avoid wasting the time of others.
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| Re: OT: Can someone explain this? [message #183349 is a reply to message #183339] |
Fri, 23 December 2005 12:57 |
=HT=T-Bird
Messages: 712
Registered: June 2005
Karma: 0
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Colonel |
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| icedog90 wrote on Fri, 23 December 2005 13:45 |
Why don't you use "using namespace std;" so that you don't have to put std:: in front of everything from the iostream library?
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It's bad form. Dragging in namespaces wholesale leads to name conflicts m8...p.s. it's the STL, not the iostream library
HTT-Bird (IRC)
HTTBird (WOL)
Proud HazTeam Lieutenant.
BlackIntel Coder & Moderator.
If you have trouble running BIATCH on your FDS, have some questions about a BIATCH message or log entry, or think that BIATCH spit out a false positive, PLEASE contact the BlackIntel coding team and avoid wasting the time of others.
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