--- loncom/homework/caparesponse/caparesponse.c	2004/12/23 18:32:50	1.15
+++ loncom/homework/caparesponse/caparesponse.c	2004/12/23 18:36:42	1.16
@@ -1,6 +1,6 @@
 /* The LearningOnline Network with CAPA 
  * CAPA wrapper code
- * $Id: caparesponse.c,v 1.15 2004/12/23 18:32:50 albertel Exp $
+ * $Id: caparesponse.c,v 1.16 2004/12/23 18:36:42 albertel Exp $
  *
  * Copyright Michigan State University Board of Trustees
  *
@@ -156,6 +156,7 @@ int caparesponse_get_real_response (char
     }
   }
   if( !all_alphabet ) {
+    tmp_unit_str[0]=NULL;
     outcome = split_num_unit(answer,&n_part,input,tmp_unit_str);
     if( outcome > 1 ) { /* with both num and unit parts or only unit part */
       if( ans_unit != NULL ) {