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Date: | Wed, 1 Apr 2009 14:48:34 +0000 (GMT) |
From: | Marco Atzeri <marco_atzeri AT yahoo DOT it> |
Subject: | complex number |
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Dear All, I was trying to understand why this code #include <iostream> #include <complex> int main() { double a =3D 0; double b =3D 1. / a; a +=3D 1; std::cout << std::abs (std::complex<double> (b, a)) << '\n'; } produce Inf on most platform and NaN on cygwin. I found that newlib have the function cabs (complex absolute) but in cygwin the prototypes is extern double cabs(); so just a placeholder but not a useful function. There is any reason why cygwin is missing functional C99 complex functions ? For what I can see mingw has not such limitation in /usr/include/mingw/complex.h double __MINGW_ATTRIB_CONST cabs (double _Complex); Thanks Marco -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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