| .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) |
| .\" Distributed under GPL |
| .\" |
| .TH CREAL 3 2007-12-26 "" "Linux Programmer's Manual" |
| .SH NAME |
| creal, crealf, creall \- get real part of a complex number |
| .SH SYNOPSIS |
| .B #include <complex.h> |
| .sp |
| .BI "double creal(double complex " z ); |
| .br |
| .BI "float crealf(float complex " z ); |
| .br |
| .BI "long double creall(long double complex " z ); |
| .sp |
| Link with \fI\-lm\fP. |
| .SH DESCRIPTION |
| The |
| .BR creal () |
| function returns the real part of the complex number |
| .IR z . |
| .LP |
| One has: |
| .nf |
| |
| z = creal(z) + I * cimag(z) |
| .fi |
| .SH "CONFORMING TO" |
| C99. |
| .SH NOTES |
| The gcc supports also __real__. |
| That is a GNU extension. |
| .SH "SEE ALSO" |
| .BR cabs (3), |
| .BR cimag (3), |
| .BR complex (7) |
