---
name: "VistaIONumber"
section: "3"
platform: "linux"
package: "libvistaio-dev"
version: "1.2.19-3+b2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/VistaIONumber"
---

# VistaIONumber(3)

determine the number of array elements

## NAME

VistaIONumber - determine the number of array elements

## SYNTAX

```
#include <vistaio.h>
```

**size\_t VistaIONumber (***array***)**

**ArrayVariable** *array***;**

## ARGUMENTS

- *array*

  **Specifies a fixed-size array.**

## DESCRIPTION

**The VistaIONumber macro returns the number of elements in the specified** **array (computed as the size of the array divided by the size of an array** **element).**

## SEE ALSO

## NOTES

**It is equivalent to the X Toolkit macro XtNumber(3Xt).**