From 8b57a223abc46003e8545210deefca307af4d666 Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Fri, 16 Sep 2011 05:19:27 +0200
Subject: [PATCH] cacosh.3: Add example program

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man3/cacosh.3 | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/man3/cacosh.3 b/man3/cacosh.3
index bf3d99be8..4349906d7 100644
--- a/man3/cacosh.3
+++ b/man3/cacosh.3
@@ -36,6 +36,36 @@ 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;
+
+    if (argc != 3) {
+        fprintf(stderr, "Usage: %s <real> <imag>\\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    z = atof(argv[1]) + atof(argv[2]) * I;
+
+    c = cacosh(z);
+    printf("cacosh() = %6.3f %6.3f*i\\n", creal(c), cimag(c));
+
+    f = 2 * clog(csqrt((z + 1)/2) + csqrt((z \- 1)/2));
+    printf("formula  = %6.3f %6.3f*i\\n", creal(f2), cimag(f2));
+
+    exit(EXIT_SUCCESS);
+}
+.fi
 .SH "SEE ALSO"
 .BR acosh (3),
 .BR cabs (3),