math - How to use a built-in tcl power function? -

i using tcl version /tools/tcl/8.4.11/linux64/bin/tcl

may know how can use built in power function in tcl script?

i tried not work.

namespace import ::tcl::mathfunc::* puts [pow 10 2] 

 unknown namespace in import pattern "::tcl::mathfunc::*"     while executing "namespace import ::tcl::mathfunc::\*" 

may know why?

that feature introduced in tcl 8.5. in 8.4 , before, functions implemented using special api nobody understood (passing around pointers tcl_value structures, rather strange).

the pow() function floating point function in versions of tcl (even if written call ::tcl::mathfunc::pow). integer exponentiation available via ** operator (requires tcl 8.5, first version support arbitrary size integers):

puts [expr { 10 ** 2 }] 

# note namespace puts [tcl::mathop::** 10 2] 

namespace import tcl::mathop::* puts [** 10 2] 

the ** operator equivalent pow() if either of arguments floating point number (and indeed call same function in standard c math library behind scenes).