* numeric.c (flo_round): use pow instead of while-loop. fixes ruby#4510

patched by Alex Young [ruby-core:35526] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31146 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
lann · Mar 22, 2011 · 2c1936c · 2c1936c
1 parent 12d1744
commit 2c1936c
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Mar 22 09:38:19 2011  NARUSE, Yui  <[email protected]>
+
+	* numeric.c (flo_round): use pow instead of while-loop. fixes #4510
+	  patched by Alex Young [ruby-core:35526]
+
 Tue Mar 22 06:47:46 2011  NARUSE, Yui  <[email protected]>
 
 	* ext/date/date_strftime.c (date_strftime_wo_timespec):

diff --git a/numeric.c b/numeric.c
@@ -1479,17 +1479,14 @@ flo_round(int argc, VALUE *argv, VALUE num)
 {
     VALUE nd;
     double number, f;
-    int ndigits = 0, i;
+    int ndigits = 0;
     long val;
 
     if (argc > 0 && rb_scan_args(argc, argv, "01", &nd) == 1) {
 	ndigits = NUM2INT(nd);
     }
     number  = RFLOAT_VALUE(num);
-    f = 1.0;
-    i = abs(ndigits);
-    while  (--i >= 0)
-	f = f*10.0;
+    f = pow(10, abs(ndigits));
 
     if (isinf(f)) {
 	if (ndigits < 0) number = 0;