Hello I am getting strange results for the fmod function in math.h. float f, g; for (f = 0.0; f < 4.0 * PI; f += (5.0 * PI / 180.0)) { g = fmod(f, (2.0 * PI)); printf("%f %f\r\n", f * 180.0 / PI, g * 180.0 / PI); } For first sweep from 0.0 to 2 * PI, I get zero for remainder, for second sweep from 2 * PI to 4 * PI if get sensible numbers. Compared in Visual C++ and first sweep produces remainders as expected. Is this a bug in fmod? Thanks!