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From: Jim Michaels <jmichae3 AT yahoo DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: bug in math.h
Date: Mon, 14 Feb 2011 10:32:57 -0800 (PST)
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lround, round, and powl and I'm sure others to not show up in math.h.


#include <math.h>
using namespace std;

            int32_t n=lround(440*powl(2, (((double(octave)-3) * 12.0)
+ double(note)) / 12.0));

this is for calculating the frequency of a musical note.

beep.cpp:111: error: 'powl' was not declared in this scope
beep.cpp:111: error: 'lround' was not declared in this scope

I looked at the source code for math.h and what it includes, and it is
supposed to define these two, as does mingw-w64.

using std::tr1::lround;

but lround is not defined from what I can see.
pow is.  I should think powl should be defined, but it is not.

when I use pow and round, I get the following error message:
            int32_t n=round(440*pow(2, (((double(octave)-3) * 12.0) +
double(note)) / 12.0));
beep.cpp:111: error: 'round' was not declared in this scope