--- loncom/homework/default_homework.lcpm	2001/12/21 21:37:26	1.44
+++ loncom/homework/default_homework.lcpm	2002/02/06 16:18:26	1.46
@@ -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 1.44 2001/12/21 21:37:26 matthew Exp $
+# $Id: default_homework.lcpm,v 1.46 2002/02/06 16:18:26 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -101,6 +101,11 @@ sub caparesponse_check {
     $sig_ubound =15; #SIG_UB_DEFAULT
   } else {
     ($sig_lbound,$sig_ubound) = split /,/,$sig;
+    if (!$sig_lbound) {
+      $sig_lbound = 0; #SIG_LB_DEFAULT
+      $sig_ubound =15; #SIG_UB_DEFAULT
+    }
+    if (!$sig_ubound) { $sig_ubound=$sig_lbound; }
   }
   my $result = &caparesponse_capa_check_answer($response,$answer,$type,
 					       $tol_type,$tol,
@@ -238,6 +243,7 @@ sub random {
     srand($external::randomseed);
     $hidden::RANDOMINIT=1;
   }
+  if (!defined($step)) { $step=1; }
   my $num=1+int(($end-$start)/$step);
   my $result=$start + int(rand() * $num)*$step;
   return $result;
@@ -439,6 +445,27 @@ sub format {
   return sprintf('%.'.$fmt,$value);
 }
 
+sub prettyprint {
+  my ($value,$fmt)=@_;
+  my $result;
+  if ($fmt) { $value=sprintf('%.'.$fmt,$value); }
+  if ($value =~ /([0-9\.\-\+]+)E([0-9\-\+]+)/ ) {
+    my $frac=$1;
+    my $exponent=$2;
+    $exponent=~s/^\+0*//;
+    if ($external::target eq 'web') {
+      $result=$frac.'&#215;10<sup>'.$exponent.'</sup>';
+    } elsif ($external::target eq 'tex') {
+      $result='\ensuremath{'.$frac.'\times 10^{'.$exponent.'}}';
+    } else {
+      $result=$value;
+    }
+  } else {
+    $result=$value;
+  }
+  return $result;
+}
+
 sub map {
     my ($phrase,$dest,$source)=@_;
     my @seed = &random_seed_from_phrase($phrase);