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# proc and upvar problem

## proc and upvar problem

(OP)
I am writing a tcl program which seems to be getting larger and larger. I am now facing a dilemma that my quick and dirty use of globals is getting out of hands.
I am using them since I do not seem to be able to use upvar or something correctly.

Even the example from tcl book
proc incr { varName {amount 1}} {
upvar 1 $varName var if {[info exists var]} { set var [exor$var + $amount] } else { set var$amount
}
return $var } set a 5 puts [incr$a 2]
puts $a is not working for me. Variable a remains in value 5 and the incr procedure actually returns 2. More to the point what I am looking for is something with multiple variables and without return, I want to change the value of the variables within procedure. proc incr_a_b_upvar { a b c} { puts "a =$a"
puts "b = $b" puts "c =$c"
upvar 1 $a a_sub upvar 1$b b_sub
# set a_sub $a # set b_sub$b

puts "a_sub = $a_sub" puts "b_sub =$b_sub"

set a [expr {$a +$c}]
set b [expr {$b +$c}]
}
set a 2
set b 3
set c 1
incr_a_b_upvar $a$b $c puts "a =$a"
puts "b = $b" puts "c =$c"

Without those now uncommented set a_sub \$a commands I get an error message about unknown variables, with those commands I still do not get what I want.

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