[gnome-calculator] Fix for improving integer exponentiation

[Arth Patel <arthpatel src gnome org>]

commit 5ee866bf6ea1a566df98b66633e5667cc8ff86dd
Author: Garima Joshi <garimajoshi3 yahoo in>
Date:   Wed May 22 14:53:47 2013 +0530

    Fix for improving integer exponentiation

 src/number.vala |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/src/number.vala b/src/number.vala
index 5805502..4672e14 100644
--- a/src/number.vala
+++ b/src/number.vala
@@ -931,11 +931,14 @@ public class Number
         else
             t = this;
 
-        /* Multply x n times */
-        // FIXME: Can do z = z.multiply (z) until close to answer (each call doubles number of multiples) */
         var z = new Number.integer (1);
-        for (var i = 0; i < n; i++)
-            z = z.multiply (t);
+        while (n != 0)
+        {
+            if (n % 2 == 1)
+                z = z.multiply (t);
+            t = t.multiply (t);
+            n = n / 2;
+        }
         return z;
     }