Better explanation

Doc/Sd1/Appendix/Exam/2024/Summer/exam.xml

@@ -167,11 +167,11 @@ System.out.println(1000000000 - 1000000000 + 0.000000001);</programlisting></td>
             byte <code language="java">double</code> cannot express enough
             digits for expressing this.</para>
 
-            <para>Longer answer: The int literal <code
-            language="java">1000000000</code> being converted to a <code
-            language="java">double</code> value is being represented as 8 byte
-            IEEE 754. Due to its inherently limited precision the above sums
-            gets truncated. We consider:</para>
+            <para>Longer answer: For summing up the int literal <code
+            language="java">1000000000</code> gets being converted into a
+            <code language="java">double</code> value being represented as 8
+            byte IEEE 754. Due to its inherently limited precision the above
+            sums gets truncated. We consider:</para>
 
             <informaltable border="1">
               <tr>
@@ -185,10 +185,16 @@ System.out.println(1000000000 - 1000000000 + 0.000000001);</programlisting></td>
 
                 <td valign="top"><screen>true</screen></td>
               </tr>
+
+              <tr>
+                <td valign="top"><programlisting language="java">System.out.println(1000000000.0 == 1000000000 + 0.000000001);</programlisting></td>
+
+                <td valign="top"><screen>true</screen></td>
+              </tr>
             </informaltable>
 
             <para>Thus in 8 byte IEEE 754 representation both <code
-            language="java">1000000000</code> and the expression <code
+            language="java">1000000000.0</code> and the expression <code
             language="java">1000000000 + 0.000000001</code> amount to the
             exact same value. Evaluating from left to right we thus
             have:</para>
@@ -196,7 +202,7 @@ System.out.println(1000000000 - 1000000000 + 0.000000001);</programlisting></td>
             <itemizedlist>
               <listitem>
                 <para><code language="java">1000000000 + 0.000000001 -
-                1000000000</code> = <code language="java">1000000000 -
+                1000000000</code> = <code language="java">1000000000.0 -
                 1000000000</code> = <code language="java">0.0</code>.</para>
               </listitem>