adjusting section 2

lectures/06_memory/README.md

@@ -29,7 +29,8 @@ Dynamic memory is:
 <table>
  <tr>
   <td>
-<pre>
+
+ <pre>
 int * p = new int;
 *p = 17;
 cout << *p << endl;
@@ -44,25 +45,38 @@ p = temp;
 cout << *p << " " << *q << endl;
 delete p;
 delete q;
-</pre>
+ </pre>
+
 </td>
 <td><img src="heap.png" alt="heap"</td>
 </tr>
 </table>
+
 <!--[alt text](heap.png "heap")-->
 
-- The expression new int asks the system for a new chunk of memory that is large enough to hold an integer
+- The expression *new int* asks the system for a new chunk of memory that is large enough to hold an integer
-and returns the address of that memory. Therefore, the statement int * p = new int; allocates memory
+and returns the address of that memory. Therefore, the statement
-from the heap and stores its address in the pointer variable p.
+
-- The statement delete p; takes the integer memory pointed by p and returns it to the system for re-use.
+```cpp
-- This memory is allocated from and returned to a special area of memory called the heap. By contrast, local
+int * p = new int; 
-variables and function parameters are placed on the stack as discussed last lecture.
+```
-- In between the new and delete statements, the memory is treated just like memory for an ordinary variable,
+
+allocates memory from the heap and stores its address in the pointer variable *p*.
+
+- The statement
+
+```cpp
+delete p;
+```
+
+takes the integer memory pointed by *p* and returns it to the system for re-use.
+- This memory is allocated from and returned to a special area of memory called the **heap**. By contrast, local
+variables and function parameters are placed on the stack.
+- In between the *new* and *delete* statements, the memory is treated just like memory for an ordinary variable,
 except the only way to access it is through pointers. Hence, the manipulation of pointer variables and values is
-similar to the examples covered in Lecture 5 except that there is no explicitly named variable for that memory
+similar to the examples covered in the pointers lecture except that there is no explicitly named variable for that memory
 other than the pointer variable.
-- Dynamic allocation of primitives like ints and doubles is not very interesting or significant. What’s more
+- Dynamic allocation of primitives like ints and doubles is not very interesting or significant. What’s more important is dynamic allocation of arrays and class objects.
-important is dynamic allocation of arrays and objects.
 
 ## 6.3 Exercises