man3/cimag.3

   1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
   2 .\" Distributed under GPL
   3 .\"
   4 .TH CIMAG 3 2008-08-11 "" "Linux Programmer's Manual"
   5 .SH NAME
   6 cimag, cimagf, cimagl \- get imaginary part of a complex number
   7 .SH SYNOPSIS
   8 .B #include <complex.h>
   9 .sp
  10 .BI "double cimag(double complex " z ");"
  11 .br
  12 .BI "float cimagf(float complex " z ");"
  13 .br
  14 .BI "long double cimagl(long double complex " z ");"
  15 .sp
  16 Link with \fI\-lm\fP.
  17 .SH DESCRIPTION
  18 The
  19 .BR cimag ()
  20 function returns the imaginary part of the complex number
  21 .IR z .
  22 .LP
  23 One has:
  24 .nf
  25
  26     z = creal(z) + I * cimag(z)
  27 .fi
  28 .SH VERSIONS
  29 These functions first appeared in glibc in version 2.1.
  30 .SH CONFORMING TO
  31 C99.
  32 .SH NOTES
  33 gcc also supports __imag__.
  34 That is a GNU extension.
  35 .SH SEE ALSO
  36 .BR cabs (3),
  37 .BR creal (3),
  38 .BR complex (7)