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catan.3: Add example program 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2011-09-16 05:19:51 +02:00
parent 8b57a223ab
commit c05ed63add
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man3/catan.3
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@ -1,4 +1,5 @@
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" and Copyright (C) 2011 Michael Kerrisk <mtk.manpages@gamil.com>
.\" Distributed under GPL
.\"
.TH CATAN 3 2011-09-15 "" "Linux Programmer's Manual"
@ -31,6 +32,37 @@ One has:
These functions first appeared in glibc in version 2.1.
.SH "CONFORMING TO"
C99.
.SH EXAMPLE
.nf
/* Link with "\-lm" */
#include <complex.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
double complex z, c, f;
double complex i = I;
if (argc != 3) {
fprintf(stderr, "Usage: %s <real> <imag>\\n", argv[0]);
exit(EXIT_FAILURE);
}
z = atof(argv[1]) + atof(argv[2]) * I;
c = catan(z);
printf("catan() = %6.3f %6.3f*i\\n", creal(c), cimag(c));
f = (clog(1 + i * z) \- clog(1 \- i * z)) / (2 * i);
printf("formula = %6.3f %6.3f*i\\n", creal(f2), cimag(f2));
exit(EXIT_SUCCESS);
}
.fi
.SH "SEE ALSO"
.BR ccos (3),
.BR clog (3),