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

## **Overview**<a name="section891691926093538"></a>

**Related Modules:**

[MATH](zh-cn_topic_0000001055039462.md)

**Description:**

Defines the floating-point environment. 

## **Summary**<a name="section1478763308093538"></a>

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

<a name="table316388255093538"></a>
<table><thead align="left"><tr id="row261617370093538"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p1595593002093538"><a name="p1595593002093538"></a><a name="p1595593002093538"></a>Variable Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p831016895093538"><a name="p831016895093538"></a><a name="p831016895093538"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row11956881093538"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1506903743093538"><a name="p1506903743093538"></a><a name="p1506903743093538"></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="p313601554093538"><a name="p313601554093538"></a><a name="p313601554093538"></a>unsigned long&nbsp;</p>
</td>
</tr>
</tbody>
</table>

## **Details**<a name="section802733472093538"></a>

## **Field Documentation**<a name="section1272210042093538"></a>

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

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

 **Description:**

Floating-point environment parameters