[goffice] Constants: add print statements for 180/pi and pi/180

[Morten Welinder <mortenw src gnome org>]

commit 300199b342aa486853f9923ad39a032c443260d4
Author: Morten Welinder <terra gnome org>
Date:   Fri Nov 24 20:52:28 2017 -0500

    Constants: add print statements for 180/pi and pi/180
    
    This answers the question whether those constants can be computed
    accurately using double math.  Evidently they can.

 tests/constants.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tests/constants.c b/tests/constants.c
index 16ab30d..45e0a9f 100644
--- a/tests/constants.c
+++ b/tests/constants.c
@@ -253,6 +253,8 @@ main (int argc, char **argv)
        go_quad_init (&qc, 180);
        go_quad_div (&qc, &qc, &go_quad_pi);
        examine_constant ("180/pi", &qc);
+       g_printerr ("180/pi computed as double: %.55g\n", 180 / M_PI);
+       g_printerr ("pi/180 computed as double: %.55g\n", M_PI / 180);
 
        go_quad_end (state);