title: dynamic memory allocation
body: <p>how allocate memory dynamically for the array of stucture....
  eg:</p>
  
  <pre><code>class students
  {
      struct stud
          {
             int r_no;
             char name[20];
           }*s; 
  }
  </code></pre>
  
  <p>how to allocate memory dynamically for *s...</p>