[expr] function available since [Tcl] 8.5:
Converts a number to ''some'' integral type ([int], [wide] or [bignum]).

The name of this function is derived from French, via ALGOL.
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[LV] So, this is functionally similar to a cast? What happens when
the number being entiered doesn't fit into the size type? A bignum being
''cast'' into an int, for instance?

''[escargo] 29 Nov 2006'' - It's more like the '''round''' function.
I think the point is that however big the number might be, it will pick
the smallest integral type that will hold it.
See TIP 237 [http://tip.tcl.tk/237] for full details.

[DKF]: It's unspecified what size of value you get beyond "big enough", and a bignum is big enough to take any integer you want (assuming you've got the memory to hold it...)
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[[[Category Glossary]|[Category Command]:[expr]]]