--- loncom/homework/default_homework.lcpm	2005/11/16 22:18:22	1.104
+++ loncom/homework/default_homework.lcpm	2005/11/16 23:17:39	1.105
@@ -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 1.104 2005/11/16 22:18:22 albertel Exp $
+# $Id: default_homework.lcpm,v 1.105 2005/11/16 23:17:39 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -182,23 +182,24 @@ sub caparesponse_check {
 
 sub caparesponse_check_list {
     my $response=$LONCAPA::CAPAresponse_args{'response'};
-    my ($result,@list);
-    @list=@LONCAPA::CAPAresponse_answer;
-    my $aresult='';
-    my $current_answer;
-    my $answers=join(':',@list);
-    $result.="Got response :$answers:\n";
-    &LONCAPA_INTERNAL_DEBUG("<blink>Yo!</blink> got ".join(':',%LONCAPA::CAPAresponse_args));
+    my $result="Got response :".join(':',@LONCAPA::CAPAresponse_answer).":\n";
+    &LONCAPA_INTERNAL_DEBUG("args ".join(':',%LONCAPA::CAPAresponse_args));
     my @responselist;
     my $type = $LONCAPA::CAPAresponse_args{'type'};
     $result.="Got type :$type:\n";
-    if ($type ne '' && $#list > 0) {
+    if ($type ne '' && $#LONCAPA::CAPAresponse_answer > 0) {
 	(@responselist)=split(/,/,$response);
+	if (@responselist < @LONCAPA::CAPAresponse_answer) {
+	    return 'MISSING_ANSWER';
+	}
+	if (@responselist > @LONCAPA::CAPAresponse_answer) {
+	    return 'EXTRA_ANSWER';
+	}
     } else {
 	(@responselist)=($response);
     }
-    my $unit='';
     $result.="Initial final response :$responselist['-1']:\n";
+    my $unit;
     if ($type eq '' || $type eq 'float') {
 	#for numerical problems split off the unit
 	if ( $responselist['-1']=~ /(.*[^\s])\s+([^\s]+)/ ) {
@@ -207,17 +208,13 @@ sub caparesponse_check_list {
 	}
     }
     $result.="Final final response :$responselist['-1']:$unit:\n";
-    $result.=":$#list: answers\n";
     $unit=~s/\s//;
-    my $i=0;
-    my $awards='';
-    my @msgs;
-    for ($i=0; $i<@list;$i++) {
-	my $msg;
-	$result.="trying answer :$list[$i]:\n";
-	my $thisanswer=$list[$i];
+
+    my ($awards, @msgs);
+    foreach my $thisanswer (@LONCAPA::CAPAresponse_answer) {
+	my ($msg,$aresult);
 	$result.="trying answer :$thisanswer:\n";
-	if (defined($list[$i])) { 
+	if (defined($thisanswer)) {
 	    if ($unit eq '') {
 		($aresult,$msg)=&caparesponse_check($thisanswer,
 						    $responselist[$i]);
@@ -227,7 +224,9 @@ sub caparesponse_check_list {
 	    }
 	} else {
 	    $aresult='ERROR';
+	    $msg='answer was undefined';
 	}
+	&LONCAPA_INTERNAL_DEBUG("after if $aresult -- $msg");
 	my ($temp)=split(/:/, $aresult);
 	$awards.="$temp,";
 	$result.=$aresult;