Provided by: tcl8.4-doc_8.4.20-7_all 

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.
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
Tcl 7.5 Tcl_GetVersion(3tcl)