The Egyptian wannabe developer/sys-admin
# Allow spaces and underscores in long number for easy reading
proc norm {num} {
if {[regexp {^(\s|\d|_)*(\.)?(\s|_)*(\d)+(\s|\d|_)*$} $num]} {
string map {_ {} \ {}} $num
} else {
error "Number: $num is not in normal form"
}
}
Example:
expr [norm 10_000_000] + [norm 100._10_100]
=> 10000100.101AMG: Neat! Here, this proc does the reverse (adds underscores):
proc abnorm {num} {
if {![string is double -strict $num]} {
error "not a number: \"$num\""
}
set point [string first . $num]
if {$point == -1} {
set point [string length $num]
} else {
for {set pos [expr {$point + 4}]} {$pos < [string length $num]} {incr pos 4} {
set num [string replace $num $pos $pos _[string index $num $pos]]
}
}
for {set pos [expr {$point - 3}]} {$pos > 0} {incr pos -3} {
set num [string replace $num $pos $pos _[string index $num $pos]]
}
return $num
}Example:
% abnorm 100.10100 100.101_00 % abnorm 10000000 10_000_000 % abnorm 10000100.101 10_000_100.101
This code doesn't handle exponential notation or even negative numbers. I don't want to put much more effort into it, since I'm more interested in seeing some clever [regsub] version. If anyone wants to give it a try, ... go right ahead. Have a blast.