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TCL: Multiple conditions in IF statement

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  • August 9, 2010 at 9:22 pm #51923
    Justin Largent
    Participant

      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.

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      • August 9, 2010 at 11:05 pm #72316
        David Barr
        Participant

          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 !=.

        • August 10, 2010 at 3:48 am #72317
          Charlie Bursell
          Participant

            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

          • August 10, 2010 at 5:01 am #72318
            Max Drown (Infor)
            Keymaster

              Hi, Justin!!!!!

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

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

              -- Max Drown (Infor)

            • August 10, 2010 at 3:36 pm #72319
              Justin Largent
              Participant

                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.

              • August 10, 2010 at 5:01 pm #72320
                David Barr
                Participant

                  Charlie Bursell wrote:

                  But the following is better

                  if { ($a eq “$b”)

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