simple codingbat string exercises

Doc/Sd1/languageFundamentals.xml

@@ -305,9 +305,13 @@
       <qandadiv>
         <qandaentry>
           <question>
-            <para>A <xref linkend="glo_Java"/> <code>int</code> is internally
-            being represented by 4 <link linkend="glo_byte">bytes</link>.
-            <inlineequation>
+            <para>In this exercise we look at an <code>int</code>'s the
+            largest and smallest possible value.</para>
+
+            <para>A <xref linkend="glo_Java"/> <code
+            xlink:href="https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html">int</code>
+            is internally being represented by 4 <link
+            linkend="glo_byte">bytes</link>. <inlineequation>
                 <m:math display="inline">
                   <m:msub>
                     <m:mi>00000000000000000000000000000101</m:mi>
@@ -579,9 +583,8 @@ System.out.println("Maximum short value:" + maximum);
             </question>
 
             <answer>
-              <para>The programmer's question is basically easy to answer:
-              Since <code>short</code> variables are being represented by to
-              bytes their range is <inlineequation>
+              <para>Since <code>short</code> variables are being represented
+              by to bytes their range is <inlineequation>
                   <m:math display="inline">
                     <m:mrow>
                       <m:mo>[</m:mo>
@@ -769,7 +772,7 @@ System.out.println("New value=" + a);
 New value=-128</programlisting>
 
               <para>Explain this strange behaviour. Moreover you'll find the
-              following code to rise a compile time error:</para>
+              following code yields a compile time error:</para>
 
               <programlisting language="noneJava">byte a = 127;
 System.out.println("value=" + a);
@@ -785,7 +788,8 @@ System.out.println("New value=" + a);</programlisting>
 
             <answer>
               <para>A byte variable ranges from -128 to +127. Thus
-              incrementing 127 by 1 yields an overflow error.</para>
+              incrementing 127 by 1 yields -128 which is an overflow
+              error.</para>
 
               <para>Since <xref linkend="glo_Java"/> uses <link
               xlink:href="http://en.wikipedia.org/wiki/Two's_complement#firstHeading">Two's
@@ -1046,6 +1050,36 @@ System.out.println("New value=" + a);</programlisting>
         </qandaentry>
       </qandadiv>
     </qandaset>
+
+    <qandaset defaultlabel="qanda" xml:id="sw1QandaStringSuppExercise">
+      <title>Supplementary string exercises</title>
+
+      <qandadiv>
+        <qandaentry>
+          <question>
+            <para xml:id="sw1QandaStringCodingBatExtra">Work on the following
+            external exercises:</para>
+
+            <itemizedlist>
+              <listitem>
+                <para
+                xlink:href="http://codingbat.com/prob/p171896">helloName</para>
+              </listitem>
+
+              <listitem>
+                <para
+                xlink:href="http://codingbat.com/prob/p161056">makeAbba</para>
+              </listitem>
+
+              <listitem>
+                <para
+                xlink:href="http://codingbat.com/prob/p147483">makeTags</para>
+              </listitem>
+            </itemizedlist>
+          </question>
+        </qandaentry>
+      </qandadiv>
+    </qandaset>
   </section>
 
   <section xml:id="sw1LanguageFundamentalUsingFinal">

Doc/Sd1/preliminaries.xml

@@ -76,7 +76,11 @@
           \\192.168.111.9\xy05 respectively.</para>
 
           <caution>
-            <para>External access requires <acronym>VPN</acronym></para>
+            <para>External access requires <link
+            xlink:href="https://wiki.mi.hdm-stuttgart.de/wiki/VPN">OpenVPN</link>.
+            Be sure to select <link
+            xlink:href="https://wiki.mi.hdm-stuttgart.de/wiki/VPN#OpenVPN_Konfigurationsdatei">HdM_MI_stud.ovpn</link>
+            to gain all MI related benefits.</para>
           </caution>
         </glossdef>
       </glossentry>