title: Using the function fread() to read blocks of data in a file
body: <p>If I use </p>
  
  <pre><code>size_t fread ( void * ptr, size_t size, size_t count, FILE * stream ),
  </code></pre>
  
  <p>how can I derefence the data pointed by ptr?. Like if I have</p>
  
  <pre><code>int main()
  {
  void *ptr
  fread(ptr,1,100,file);
  printf("%s",ptr);
  }
  </code></pre>