Escape * in C/C++ supervision 1

files/ProgC/supervision_1.html

@@ -90,10 +90,10 @@
     <p>Write a program <code>calc</code> which evaluates an expression in Reverse Polish Notation given on the command line; for example</p>
 
     <pre>
-    $ calc 2 3 4 + *
+    $ calc 2 3 4 + \*
     </pre>
 
-    <p>should print 14.</p>
+    <p>should print 14. The character <code>*</code> needs to be escaped with a backslash in some shells or otherwise it gets expanded to all the files in your current directory.</p>
 
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