if statements test a control statement to see whether it is true or false. else and elsif clauses can also be tagged on the back. 
#your basic if
if($value==1){
    print "value is equal to 1\n";
}

#your basic if/else
if($value==1){
   print "value is equal to 1\n";
} else{
   print "value is not equal to 1\n";
}

#your basic if/elsif/else

if($value==1){
   print "value is equal to 1\n";
} elsif($value==2){
   print "value is equal to 2\n";
} elsif($value==3){
   print "value is equal to 3\n"; 
} else{
   print "value is not equal to 1,2, or 3\n";
}

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Unless statements offer you the opposite functionality. If the control statement evaluates to false then the statements inside the block are executed.

Replies are listed 'Best First'.
Re: if statements
by Mr. Muskrat (Canon) on Jun 16, 2002 at 14:36 UTC
    Something else that should be mentioned... You can reverse if statements:

    ++$node if $votes > 0;

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[reply]
[d/l]
      Please supply an example of your reverse if statement syntax... PL
[reply]
        That is a reversal of the "usual" if at the front of the statement.
[reply]
[d/l]

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