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Hi DaveK, the following test case on complex numbers is producing, puzzling result on cygwin (both 1.5 and 1,7) with gcc-4.3.2 (and also 3.4.4), while working on other platform: #include <iostream> #include "oct-cmplx.h" int main () { Complex z1 (1.0, 1.0), z2 (1.0, 1.0); std::cout << (arg(z1)) << '\n'; std::cout << (arg(z2)) << '\n'; std::cout << (arg(z1)<arg(z2)) << '\n'; std::cout << (arg(z1)-arg(z2)) << '\n'; } $ g++-4 comp_2.cc -o0 -o comp_2 $ ./comp_2 0.785398 0.785398 1 -3.06287e-17 <<-- arg(1+i) is lower then arg(1+i) !! Using different complex numbers is also possible to get arg(-1-i) bigger then arg(-1-i) Any idea what could cause it ? newlib ? Thanks Marco
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