Maura Edeweiss Monville writes:

Is it possible that on a 32-bit machine the maximum value for a Real number in Tcl language is 10^10 ?

See: http://wiki.tcl.tk/11969 "Computers and real numbers" The maximum range for Tcl is 1.0e-200 to 1.0e+200, but the precision is only 12 to 13 decimals. There are arbitrary precision Tcl library packages available which are mentioned in that article.

Instinctively I'd saythe number of bits assigned to the representation of a Real number is independent on the machine h/w architecture ... but I'm not familiar with Tcl and may be mistaken ...