Question: How can I get the minimum and maximum exponent for 32- and 64-bit real numbers? I am doing some work to avoid underflows and overflows and would need to know those numbers. 

I would also need the base for floating point numbers.

Is it possible in fortran to get the equivalent of `ilmach`?

Answer: 
Use the `$('.audio')` collection as the source for index to be determined

```js
$('.audio_btn').unbind('click');
$('.audio_btn').bind('click', function(event) {
  console.log($('.audio').index($(this).parents('.audio')));
});
```

```html
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="myList">
  <li class="text">My Text</li>
  <li class="audio">
    <input type="button" class="audio_btn" value="play">
  </li>
  <li class="video">My Video</li>
  <li class="text">My Text</li>
  <li class="text">My Text</li>
  <li class="text">My Text</li>
  <li class="audio">
    <input type="button" class="audio_btn" value="play">
  </li>
  <li class="text">My Text</li>
  <li class="text">My Text</li>
</ul>
```
You can just add the `.audio` selector to the index method : 

```js
$('.audio_btn').unbind('click');
$('.audio_btn').bind('click', function(event){
    alert($(this).parents('.audio').index('.audio'));
});
```

```html
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="myList">
    <li class="text">My Text</li>
    <li class="audio"><input type="button" class="audio_btn" value="play"></li>
    <li class="video">My Video</li>
    <li class="text">My Text</li>
    <li class="text">My Text</li>
    <li class="text">My Text</li>
    <li class="audio"><input type="button" class="audio_btn" value="play"></li>
    <li class="text">My Text</li>
    <li class="text">My Text</li>
</ul>
```

Reference : <https://api.jquery.com/index/>