INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Member Login

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips now!

Talk With Other Members
Be Notified Of Responses
To Your Posts
Keyword Search
One-Click Access To Your
Favorite Forums
Automated Signatures
On Your Posts
Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

LINK TO THIS FORUM!

Tek-Tips LinkedIn^® Group

Join our
LinkedIn^® Group!

Hook up with past and present colleagues and classmates quickly.

Partner With Us!

"Best Of Breed" Forums Add Stickiness To Your Site

(Download This Button Today!)

Feedback

"...I just wanted to say how much I have enjoyed these forums. I am a new user and have a lot of elementary questions. I get quick answers with a friendly attitude..."

More...

Geography

Where in the world do Tek-Tips members come from?

Click Here To Find Out!

Tek-Tips Shirts!

Get your
Tek-Tips Forums
SWAG here!

Home > Forums > Programmers > Languages > Tcl/Tk Forum

why i canno check my variable is empty or not?

Read More Threads Like This One

jloh81 (Programmer)

25 Jul 10 22:59

hi,

i want to check whether the x is a empty list, if not empty list i want perform some function, below is the code.

The function that i want to perform is: I have 2 list, and i want to check whether this 2 list have the same element or not? if not the same, get the extra element.

foreach i $io {
if { $x == ""} {
continue
} elseif { $x != ""} {
if {[lsearch -exact $x $i] == -1} {
lappend y $i
}else {
set x $io
}

please advice.
Thanks

jloh81 (Programmer)

26 Jul 10 2:34

hi,

I found a command :

compare-list lista # listb list c

why i cannot use it like that? What is the correct way to use this command?

Please advice asap!
THanks

Bong (Programmer)

26 Jul 10 12:10

I never heard of list compare command

_________________
Bob Rashkin

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Back To Forum

Back To Tcl/Tk