---
name: "GetVersion"
section: "3"
platform: "macos"
package: "tcl"
version: "152"
release: "macOS 26.5"
platforms: ["macos"]
url: "https://new.carta.tech/GetVersion"
---

# GetVersion(3)

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

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

**Tcl\_GetVersion** accepts 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