# fenv\_t<a name="ZH-CN_TOPIC_0000001054918199"></a>

-   [Overview](#section872157926165636)
-   [Summary](#section276405820165636)
-   [Data Fields](#pub-attribs)
-   [Details](#section1174696404165636)
-   [Field](#section1438030290165636)
-   [\_\_cw](#aecc6604b429c015596941f5eb8a2b776)

## **Overview**<a name="section872157926165636"></a>

**Related Modules:**

[MATH](MATH.md)

**Description:**

Defines the floating-point environment. 

## **Summary**<a name="section276405820165636"></a>

## Data Fields<a name="pub-attribs"></a>

<a name="table629175024165636"></a>
<table><thead align="left"><tr id="row694326325165636"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p1842259242165636"><a name="p1842259242165636"></a><a name="p1842259242165636"></a>Variable Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p1044196631165636"><a name="p1044196631165636"></a><a name="p1044196631165636"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row1814357654165636"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p210992811165636"><a name="p210992811165636"></a><a name="p210992811165636"></a><a href="fenv_t.md#aecc6604b429c015596941f5eb8a2b776">__cw</a></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1475999823165636"><a name="p1475999823165636"></a><a name="p1475999823165636"></a>unsigned long </p>
</td>
</tr>
</tbody>
</table>

## **Details**<a name="section1174696404165636"></a>

## **Field **<a name="section1438030290165636"></a>

## \_\_cw<a name="aecc6604b429c015596941f5eb8a2b776"></a>

```
unsigned long fenv_t::__cw
```

 **Description:**

Floating-point environment parameters