---
name: "GetVersion"
section: "3tcl"
platform: "linux"
package: "tcl8.3-doc"
version: "8.3.5-13"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/GetVersion/3tcl"
---

# GetVersion(3tcl)

get the version of the library at runtime

```

```

## NAME

Tcl\_GetVersion - get the version of the library at runtime

## SYNOPSIS

```
#include <tcl.h>

Tcl_GetVersion(major, minor, patchLevel, type)
```

## ARGUMENTS

- int *\*major* (out)

  Major version number of the Tcl library.

- int *\*minor* (out)

  Minor version number of the Tcl library.

- int *\*patchLevel* (out)

  The patch level of the Tcl library (or alpha or beta number).

- Tcl\_ReleaseType *\*type* (out)

  The type of release, also indicates the type of patch level. Can be one of **TCL\_ALPHA\_RELEASE**, **TCL\_BETA\_RELEASE**, or  **TCL\_FINAL\_RELEASE**.

  ```

  ```

## DESCRIPTION

**Tcl\_GetVersion** should be used to query the version number of the Tcl library at runtime.  This is useful when using a  dynamically loaded Tcl library or when writing a stubs-aware extension.  For instance, if you write an extension that is linked against the Tcl stubs library, it could be loaded into a program linked to an older version of Tcl than you expected. Use **Tcl\_GetVersion** to verify that fact, and possibly to change the behavior of your extension.

If may pass a NULL for any of the arguments. For instance if  you do not care about the *patchLevel* of the library, pass a NULL for the *patchLevel* argument.

## KEYWORDS

version, patchlevel, major, minor, alpha, beta, release