Update content for html

1 files changed, 53 insertions, 38 deletions

diff --git a/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html b/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html
index 85ececb0..a8eeaea7 100644
--- a/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html
+++ b/gemfeed/2016-11-20-object-oriented-programming-with-ansi-c.html
@@ -27,61 +27,73 @@
 <br />
 <span>Let's have a look at the following sample program. All you have to do is to add a function pointer such as "calculate" to the definition of struct "something_s". Later, during the struct initialization, assign a function address to that function pointer:</span><br />
 <br />
-<pre>
-#include &lt;stdio.h&gt;
+<!-- Generator: GNU source-highlight 3.1.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><b><font color="#000080">#include</font></b> <font color="#FF0000">&lt;stdio.h&gt;</font>
 
-typedef struct {
-    double (*calculate)(const double, const double);
-    char *name;
-} something_s;
+<b><font color="#0000FF">typedef</font></b> <b><font color="#0000FF">struct</font></b> <font color="#FF0000">{</font>
+    <font color="#009900">double</font> <font color="#990000">(*</font>calculate<font color="#990000">)(</font><b><font color="#0000FF">const</font></b> <font color="#009900">double</font><font color="#990000">,</font> <b><font color="#0000FF">const</font></b> <font color="#009900">double</font><font color="#990000">);</font>
+    <font color="#009900">char</font> <font color="#990000">*</font>name<font color="#990000">;</font>
+<font color="#FF0000">}</font> something_s<font color="#990000">;</font>
 
-double multiplication(const double a, const double b) {
-    return a * b;
-}
+<font color="#009900">double</font> <b><font color="#000000">multiplication</font></b><font color="#990000">(</font><b><font color="#0000FF">const</font></b> <font color="#009900">double</font> a<font color="#990000">,</font> <b><font color="#0000FF">const</font></b> <font color="#009900">double</font> b<font color="#990000">)</font> <font color="#FF0000">{</font>
+    <b><font color="#0000FF">return</font></b> a <font color="#990000">*</font> b<font color="#990000">;</font>
+<font color="#FF0000">}</font>
 
-double division(const double a, const double b) {
-    return a / b;
-}
+<font color="#009900">double</font> <b><font color="#000000">division</font></b><font color="#990000">(</font><b><font color="#0000FF">const</font></b> <font color="#009900">double</font> a<font color="#990000">,</font> <b><font color="#0000FF">const</font></b> <font color="#009900">double</font> b<font color="#990000">)</font> <font color="#FF0000">{</font>
+    <b><font color="#0000FF">return</font></b> a <font color="#990000">/</font> b<font color="#990000">;</font>
+<font color="#FF0000">}</font>
 
-int main(void) {
-    something_s mult = (something_s) {
-        .calculate = multiplication,
-        .name = "Multiplication"
-    };
+<font color="#009900">int</font> <b><font color="#000000">main</font></b><font color="#990000">(</font><font color="#009900">void</font><font color="#990000">)</font> <font color="#FF0000">{</font>
+    <font color="#008080">something_s</font> mult <font color="#990000">=</font> <font color="#990000">(</font>something_s<font color="#990000">)</font> <font color="#FF0000">{</font>
+        <font color="#990000">.</font>calculate <font color="#990000">=</font> multiplication<font color="#990000">,</font>
+        <font color="#990000">.</font>name <font color="#990000">=</font> <font color="#FF0000">"Multiplication"</font>
+    <font color="#FF0000">}</font><font color="#990000">;</font>
 
-    something_s div = (something_s) {
-        .calculate = division,
-        .name = "Division"
-    };
+    <font color="#008080">something_s</font> div <font color="#990000">=</font> <font color="#990000">(</font>something_s<font color="#990000">)</font> <font color="#FF0000">{</font>
+        <font color="#990000">.</font>calculate <font color="#990000">=</font> division<font color="#990000">,</font>
+        <font color="#990000">.</font>name <font color="#990000">=</font> <font color="#FF0000">"Division"</font>
+    <font color="#FF0000">}</font><font color="#990000">;</font>
 
-    const double a = 3, b = 2;
+    <b><font color="#0000FF">const</font></b> <font color="#009900">double</font> a <font color="#990000">=</font> <font color="#993399">3</font><font color="#990000">,</font> b <font color="#990000">=</font> <font color="#993399">2</font><font color="#990000">;</font>
 
-    printf("%s(%f, %f) =&gt; %f\n", mult.name, a, b, mult.calculate(a,b));
-    printf("%s(%f, %f) =&gt; %f\n", div.name, a, b, div.calculate(a,b));
-}
+    <b><font color="#000000">printf</font></b><font color="#990000">(</font><font color="#FF0000">"%s(%f, %f) =&gt; %f</font><font color="#CC33CC">\n</font><font color="#FF0000">"</font><font color="#990000">,</font> mult<font color="#990000">.</font>name<font color="#990000">,</font> a<font color="#990000">,</font> b<font color="#990000">,</font> mult<font color="#990000">.</font><b><font color="#000000">calculate</font></b><font color="#990000">(</font>a<font color="#990000">,</font>b<font color="#990000">));</font>
+    <b><font color="#000000">printf</font></b><font color="#990000">(</font><font color="#FF0000">"%s(%f, %f) =&gt; %f</font><font color="#CC33CC">\n</font><font color="#FF0000">"</font><font color="#990000">,</font> div<font color="#990000">.</font>name<font color="#990000">,</font> a<font color="#990000">,</font> b<font color="#990000">,</font> div<font color="#990000">.</font><b><font color="#000000">calculate</font></b><font color="#990000">(</font>a<font color="#990000">,</font>b<font color="#990000">));</font>
+<font color="#FF0000">}</font>
 </pre>
 <br />
 <span>As you can see, you can call the function (pointed by the function pointer) with the same syntax as in C++ or Java:</span><br />
 <br />
-<pre>
-printf("%s(%f, %f) =&gt; %f\n", mult.name, a, b, mult.calculate(a,b));
-printf("%s(%f, %f) =&gt; %f\n", div.name, a, b, div.calculate(a,b));
+<!-- Generator: GNU source-highlight 3.1.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><b><font color="#000000">printf</font></b><font color="#990000">(</font><font color="#FF0000">"%s(%f, %f) =&gt; %f</font><font color="#CC33CC">\n</font><font color="#FF0000">"</font><font color="#990000">,</font> mult<font color="#990000">.</font>name<font color="#990000">,</font> a<font color="#990000">,</font> b<font color="#990000">,</font> mult<font color="#990000">.</font><b><font color="#000000">calculate</font></b><font color="#990000">(</font>a<font color="#990000">,</font>b<font color="#990000">));</font>
+<b><font color="#000000">printf</font></b><font color="#990000">(</font><font color="#FF0000">"%s(%f, %f) =&gt; %f</font><font color="#CC33CC">\n</font><font color="#FF0000">"</font><font color="#990000">,</font> div<font color="#990000">.</font>name<font color="#990000">,</font> a<font color="#990000">,</font> b<font color="#990000">,</font> div<font color="#990000">.</font><b><font color="#000000">calculate</font></b><font color="#990000">(</font>a<font color="#990000">,</font>b<font color="#990000">));</font>
 </pre>
 <br />
 <span>However, that's just syntactic sugar for:</span><br />
 <br />
-<pre>
-printf("%s(%f, %f) =&gt; %f\n", mult.name, a, b, (*mult.calculate)(a,b));
-printf("%s(%f, %f) =&gt; %f\n", div.name, a, b, (*div.calculate)(a,b));
+<!-- Generator: GNU source-highlight 3.1.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><b><font color="#000000">printf</font></b><font color="#990000">(</font><font color="#FF0000">"%s(%f, %f) =&gt; %f</font><font color="#CC33CC">\n</font><font color="#FF0000">"</font><font color="#990000">,</font> mult<font color="#990000">.</font>name<font color="#990000">,</font> a<font color="#990000">,</font> b<font color="#990000">,</font> <font color="#990000">(*</font>mult<font color="#990000">.</font>calculate<font color="#990000">)(</font>a<font color="#990000">,</font>b<font color="#990000">));</font>
+<b><font color="#000000">printf</font></b><font color="#990000">(</font><font color="#FF0000">"%s(%f, %f) =&gt; %f</font><font color="#CC33CC">\n</font><font color="#FF0000">"</font><font color="#990000">,</font> div<font color="#990000">.</font>name<font color="#990000">,</font> a<font color="#990000">,</font> b<font color="#990000">,</font> <font color="#990000">(*</font>div<font color="#990000">.</font>calculate<font color="#990000">)(</font>a<font color="#990000">,</font>b<font color="#990000">));</font>
 </pre>
 <br />
 <span>Output:</span><br />
 <br />
-<pre>
-pbuetow ~/git/blog/source [38268]% gcc oop-c-example.c -o oop-c-example
-pbuetow ~/git/blog/source [38269]% ./oop-c-example
-Multiplication(3.000000, 2.000000) =&gt; 6.000000
-Division(3.000000, 2.000000) =&gt; 1.500000
+<!-- Generator: GNU source-highlight 3.1.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre>pbuetow <font color="#990000">~</font>/git/blog/source <font color="#990000">[</font><font color="#993399">38268</font><font color="#990000">]%</font> gcc oop-c-example<font color="#990000">.</font>c -o oop-c-example
+pbuetow <font color="#990000">~</font>/git/blog/source <font color="#990000">[</font><font color="#993399">38269</font><font color="#990000">]%</font> <font color="#990000">.</font>/oop-c-example
+Multiplication<font color="#990000">(</font><font color="#993399">3.000000</font><font color="#990000">,</font> <font color="#993399">2.000000</font><font color="#990000">)</font> <font color="#990000">=&gt;</font> <font color="#993399">6.000000</font>
+Division<font color="#990000">(</font><font color="#993399">3.000000</font><font color="#990000">,</font> <font color="#993399">2.000000</font><font color="#990000">)</font> <font color="#990000">=&gt;</font> <font color="#993399">1.500000</font>
 </pre>
 <br />
 <span>Not complicated at all, but nice to know and helps to make the code easier to read!</span><br />
@@ -90,8 +102,11 @@ Division(3.000000, 2.000000) =&gt; 1.500000
 <br />
 <span>However, that's not really how it works in object-oriented languages such as Java and C++. The method call in this example is not a method call as "mult" and "div" in this example are not "message receivers". I mean that the functions can not access the state of the "mult" and "div" struct objects. In C, you would need to do something like this instead if you wanted to access the state of "mult" from within the calculate function, you would have to pass it as an argument:</span><br />
 <br />
-<pre>
-mult.calculate(mult,a,b));
+<!-- Generator: GNU source-highlight 3.1.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre>mult<font color="#990000">.</font><b><font color="#000000">calculate</font></b><font color="#990000">(</font>mult<font color="#990000">,</font>a<font color="#990000">,</font>b<font color="#990000">));</font>
 </pre>
 <br />
 <h2 style='display: inline'>Real object oriented programming with C</h2><br />