Signed-off-by: Jan Engelhardt <jengelh@xxxxxxx> --- man3/fmod.3 | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/man3/fmod.3 b/man3/fmod.3 index ee2333fdc..944bf4167 100644 --- a/man3/fmod.3 +++ b/man3/fmod.3 @@ -58,6 +58,20 @@ is the quotient of / .IR y , rounded toward zero to an integer. +.PP +To obtain the modulus, more specifically, the Least Positive Residue, you will +need to adjust the result from fmod like so: +.PP +.RS 4 +.nf +z = fmod(x, y); +if (z < 0) + z += y; +.fi +.RE +.PP +An alternate way to express this is with "fmod(fmod(x, y) + y, y)", but the +second fmod usually costs way more than the one branch. .SH RETURN VALUE On success, these functions return the value \fIx\fP\ \-\ \fIn\fP*\fIy\fP, -- 2.42.0
