# fsVarsAVarSet<no value>
The **fsVarsAVarSet** function can be used to set the value of a specific `AVar`.

 

##### Syntax

``` wasm
FsVarError fsVarsAVarSet(
    FsAVarId aVarId,
    FsUnitId unitId,
    FsVarParamArray param,
    double value
    FsObjectId target
);
```

 

##### Parameters

<table><thead><tr class="header"><th>Parameters</th><th>Description</th></tr></thead><tbody><tr class="odd"><td><code>aVarId</code></td><td><p>The ID of an <code>AVar</code> (found using <code>fsVarsGetAVarId</code>).</p></td></tr><tr class="even"><td><code>unitId</code></td><td>The ID of a unit (found using <code>fsVarsGetUnitId</code>).</td></tr><tr class="odd"><td><code>param</code></td><td>A parameter which might be mandatory to access the <code>AVar</code> (in the case of an indexed <code>AVar</code>, for example). Elements in <code>param</code> can be <code>FsCrc</code>, <code>String</code> or <code>index</code>.</td></tr><tr class="even"><td><code>value</code></td><td>The new value of the <code>AVar</code>.</td></tr><tr class="odd"><td><code>target</code></td><td><p>The ID of the object on which the variable is being set.</p></td></tr></tbody></table>

 

##### Return Values

This function returns `FsVarError`, where 0 means there is no error.

 

##### Example

``` wasm
FsUnitId unitId = fsVarsGetUnitId("DEGREES");
FsAVarId aVarId = fsVarsGetAVarId("ATTITUDE INDICATOR PITCH DEGREES");
FsVarParamArray param = FsCreateParamArray("i", 0);
double newValue = 123;
if (fsVarsAVarSet(simvarId, unitId, param, newValue, FS_OBJECT_ID_USER_AIRCRAFT) == FS_VAR_ERROR_NONE)
{
    // valid
}
else
{
    // error
}
```