TCL: Multiple conditions in IF statement

[Justin Largent]

I’m looking for TCL code that supports multiple conditions within an IF statement.   Something similar to a simple C IF statement, for example.

Like:

if ( (a == b)  &&  (x == y  || x != a)  )  {

  do something;

}

I can’t imagine this is a shortcoming of TCL, but I haven’t seen an example of this syntax thus far.  Multiple braces or brackets haven’t worked either.

Thanks in advance.

Topic

[David Barr]

Code:

if { ($a == $b)  && ($x == $y || $x != $a)  }  {
 do something;
}

If your variables are strings instead of numbers, then you need to use “eq” and “ne” to compare instead of == and !=.

[Charlie Bursell]

While the == and != will work for strings in Tcl the ne and eq syntax is much more ergonomic.

However, your comparisons will never work A will never be equal to be

Perhaps you meant to say:

if { ($a == $b)  && ($x == $y || $x != $a)  }  {

 do something;

}

As Dave stated.  But the following is better

if { ($a eq “$b”)  && ($x eq “$y” || $x ne “$a”)  }  {

 do something;

}

or conversley

if { [string equal $a $b] &&

             ([string equal $x $y] || ![string equal $x $a]]} {

    Do something

}

Lots of ways to do the same thing.  You could even use a regexp command

[Max Drown (Infor)]

Hi, Justin!!!!!

I like to nest if’s instead of using “and”.

if ($var eq “string”) {
[code]if ($var eq “string”) {

-- Max Drown (Infor)

[Justin Largent]

Thanks guys!  This seemed like such a simple question, I knew it had to be “operator error”.  I had tried the parentheses initially and couldn’t get it to work, and found no reference for grouping syntax for IF statements in my searching.

Your examples work just fine.  My example was just a C example showing the desired groupings, I’m not actually using those evaluations.

Howdy Max!  The nested ifs would be ok, but I’m trying to build an outgoing email string for errors and it would have resulted in building the string multiple times (for readability).  I was just trying to make if a bit more elegant.  But hey, whatever works, right? 🙂

Thanks again guys.

[David Barr]

Charlie Bursell wrote:

But the following is better

if { ($a eq “$b”)

[Author]

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