--- loncom/homework/default_homework.lcpm	2014/06/16 16:52:50	1.164
+++ loncom/homework/default_homework.lcpm	2014/06/24 17:02:33	1.165
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 #
-# $Id: default_homework.lcpm,v 1.164 2014/06/16 16:52:50 bisitz Exp $
+# $Id: default_homework.lcpm,v 1.165 2014/06/24 17:02:33 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1033,17 +1033,6 @@ sub format_significant_figures {
     $number = abs($number);
     # needed to correct for a number greater than 1 (or
     my $power = ($number < 1) ? 0 : 1;
-    if ($power && $number =~ /^\d+$/) {
-        my $nonzeros = $number;
-        $nonzeros =~ s/0+$//;
-        if (length($number) - length($nonzeros) > 1) {
-            # convert to exponential form
-            my $n = $sig-1;
-            my $numSig = sprintf('%.' . $n . 'E', $number);
-            # return number with sign
-            return $sign.$numSig;
-        }
-    }
     # could round up. Take the integer part of log10.
     my $x10 = int(log($number)/log(10));
     # find number with values left of decimal pt = # of sign figs.
@@ -1054,16 +1043,28 @@ sub format_significant_figures {
     my ($zeros) = ($xint =~ /(0+)$/);
     # return number to original magnitude
     my $numSig = $xint*10**($x10-$sig+$power);
-    # insert trailing zero's if have decimal point
-    $numSig =~ s/^(\d+)\.(\d+)(\e?(.*)?)$/$1\.$2$zeros$3/;
-    # put a decimal pt for number ending with 0 and length = # of sig fig
-    $numSig.='.' if (length($numSig) == $sig && $numSig =~ /0$/);
-    if (length($numSig) < $sig) {
-	$numSig.='.'.substr($zeros,0,($sig-length($numSig)));
+    if ($numSig =~ /^(\d+)\.(\d+)/) {
+        # insert trailing zero's if have decimal point
+        $numSig =~ s/^(\d+)\.(\d+)(\e?(.*)?)$/$1\.$2$zeros$3/;
+    } else {
+        if ($numSig =~ /0$/) {
+            # add decimal pt for number ending with 0 and length == # of sig figs
+            if (length($numSig) == $sig) {
+                $numSig.='.';
+            } elsif (length($numSig) > $sig) {
+                # exponential form for number ending with 0 and length > # of sig figs
+                my $fmtsig = $sig-1;
+                if ($fmtsig) {
+                    $numSig = sprintf('%.'.$fmtsig.'e',$numSig);
+                }
+            }
+        }
+        if (length($numSig) < $sig) {
+            $numSig.='.'.substr($zeros,0,($sig-length($numSig)));
+        }
     }
     # return number with sign
     return $sign.$numSig;
-
 }
 
 sub map {
@@ -1218,7 +1219,7 @@ sub submission {
        $output =~ s/</&lt;/g;
        $output =~ s/>/&gt;/g;
        $output =~ s/"/&quot;/g;
-   };
+   }
    return $output;
 }