small changes in exercise 5.24

Author: martin-henz

xml/chapter5/section4/subsection3.xml

@@ -368,20 +368,18 @@ ev-definition-1
   <EXERCISE>
     <INDEX>explicit-control evaluator for Scheme
     <SUBINDEX>special forms (additional)</SUBINDEX></INDEX>
-    Implement
-    <SPLITINLINE>
-      <SCHEME><SCHEMEINLINE>cond</SCHEMEINLINE></SCHEME>
-      <JAVASCRIPT><JAVASCRIPTINLINE>conditional_statements</JAVASCRIPTINLINE>
-      </JAVASCRIPT>
-    </SPLITINLINE>
-    as a new basic 
-    <SPLITINLINE>
-      <SCHEME><SCHEMEINLINE>special form</SCHEMEINLINE></SCHEME>
-      <JAVASCRIPT><JAVASCRIPTINLINE>syntactic form</JAVASCRIPTINLINE>
+    <SPLIT>
+      <SCHEME>
+	Implement
+	<SCHEMEINLINE>cond</SCHEMEINLINE>
+	as a new basic special form
+	without reducing it to
+	<SCHEMEINLINE>if</SCHEMEINLINE>. 
+      </SCHEME>
+      <JAVASCRIPT>
+	Implement conditional statements in the explicit control evaluator.
       </JAVASCRIPT>
-    </SPLITINLINE>
-    without reducing it to
-    <SCHEMEINLINE>if</SCHEMEINLINE>. 
+    </SPLIT>
     <SPLITINLINE>
       <SCHEME>
         You will have to construct a loop that tests the
@@ -392,15 +390,15 @@ ev-definition-1
       </SCHEME>
       <JAVASCRIPT>
         Note that proper handling of returns inside the consequent
-        and alternative blocks poses a hard challenge as the
+        and alternative blocks poses a challenge as the
         current implementation only supports returning from the
         outermost block in a function. One way to implement this
         is to add a new register
         <JAVASCRIPTINLINE>returning</JAVASCRIPTINLINE> that keeps
         track of whether the current function is returning. Change
         <JAVASCRIPTINLINE>ev_sequence</JAVASCRIPTINLINE> so that
         instead of checking if the next statement is a return
-        statement, the sequence loop checks inspects
+        statement, the sequence loop inspects
         <JAVASCRIPTINLINE>returning</JAVASCRIPTINLINE> to
         determine whether to continue or return. Also note that it
         is possible to nest several conditional statements, so a