[gnome-calculator] Fix precision loss of ln(e^1) (fixes bug 711766)

[Arth Patel <arthpatel src gnome org>]

commit e1ba299acfe4cf6631de4d457b9451471171ee39
Author: Daniel Renninghoff <daniel danielrenninghoff com>
Date:   Sun Feb 23 21:33:39 2014 +0100

    Fix precision loss of ln(e^1) (fixes bug 711766)
    
    ln(e^1) calculated slightly more than 1, which means that some things were broken,
    for example e^(i pi).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=711766

 src/number.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/number.vala b/src/number.vala
index 832a53a..6db386e 100644
--- a/src/number.vala
+++ b/src/number.vala
@@ -2086,6 +2086,10 @@ public class Number
 
     private Number ln_real ()
     {
+        // ln(e^1) = 1, fixes precision loss
+        if (equals (new Number.eulers ()))
+            return new Number.integer (1);
+
         /* LOOP TO GET APPROXIMATE Ln (X) USING SINGLE-PRECISION */
         var t1 = copy ();
         var z = new Number.integer (0);