#102, moving function pointers section to the end of the doc

c.html.markdown

@@ -323,33 +323,6 @@ str_reverse(c);
 printf("%s\n", c); // => ".tset a si sihT"
 */
 
-/* 
-Functions are located in known memory addresses, so they can be called 
-through function pointers. Syntax may be initially confusing.
-
-Example: use str_reverse from a pointer
-*/
-void str_reverse_through_pointer(char * str_in) {
-    // Define a function pointer variable, named f. 
-    void (*f)(char *); // Signature should exactly match the target function.
-    f = &str_reverse; // Assign the address for the actual function (determined at runtime)
-    (*f)(str_in); // Just calling the function through the pointer
-    // f(str_in); // That's an alternate but equally valid syntax for calling it.
-}
-
-/*
-As long as function signatures match, you can assign any function to the same pointer.
-Useful for passing handlers (or callback functions) around.
-Function pointers are usually typedef'd for simplicity and readability, as follows:
-*/
-
-typedef void (*my_fnp_type)(char *);
-
-// The used when declaring the actual pointer variable:
-// ...
-// my_fnp_type f; 
-
-
 ///////////////////////////////////////
 // User-defined types and structs
 ///////////////////////////////////////
@@ -390,6 +363,36 @@ int area(rect r){
     return r.width * r.height;
 }
 
+///////////////////////////////////////
+// Function pointers 
+///////////////////////////////////////
+/*
+At runtime, functions are located at known memory addresses. Function pointers are
+much likely any other pointer (they just store a memory address), but can be used 
+to invoke functions directly, and to pass handlers (or callback functions) around.
+However, definition syntax may be initially confusing.
+
+Example: use str_reverse from a pointer
+*/
+void str_reverse_through_pointer(char * str_in) {
+    // Define a function pointer variable, named f. 
+    void (*f)(char *); // Signature should exactly match the target function.
+    f = &str_reverse; // Assign the address for the actual function (determined at runtime)
+    (*f)(str_in); // Just calling the function through the pointer
+    // f(str_in); // That's an alternative but equally valid syntax for calling it.
+}
+
+/*
+As long as function signatures match, you can assign any function to the same pointer.
+Function pointers are usually typedef'd for simplicity and readability, as follows:
+*/
+
+typedef void (*my_fnp_type)(char *);
+
+// The used when declaring the actual pointer variable:
+// ...
+// my_fnp_type f; 
+
 ```
 
 ## Further Reading