[[discuss tcl variable ''type'' of int - how much data fits in that amount, when does tcl use it, when does it benefit the user, etc.]]

The expr-function int returns the 32-bit integer value of a number. 

 % expr {int(- pow(2,31))}
 -2147483648
 % expr {int(pow(2,31)-1)}
 2147483647
 % expr {int(pow(2,31))}
 integer value too large to represent
 %

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[Category Glossary]