scalar as operator 1

[cadencep45]

I want to use a scalar, ie a string contents as an operator, but am unsure how to define it. Best explained by example.

$examplecomparison = "> 0.5";
$comparision = 0.3

what I want to say is;

if ( $comparision > 0.5 )
{ print "exception created \n"; };

but I have a large number of operators and thresholds, so I want to store these in an array, that I can simply reference the comparision, something like;

if ( $comparision $examplecomparision )
{ print "exception created \n"; };

now this does not work, as I want the actual string contents to be used here.

Any idea on how to implement ?

Ta.

 

[sdslrn123]

Hi there. I am a newbie myself but I have learnt that the best way to help yourself is to try and help others...

if ( $comparision $examplecomparision )

Is there a typo in there?
Because IF is a conditional statement, do you mean IF something equals? something.

 

[cadencep45]

no typo, see the if statement about it. Its how to express it is my question. I am not saying the second statement is correct ( in fact I know its not ), but how do I get the contents of the string to be parsed rather than a string reference. There might be other ways, ie eval ?

 

[cadencep45]

oops, typo, not about it, above it in the origional post.

 

[cadencep45]

ok the answer is;

$examplecomparison = "> 0.5";
$comparision = 0.3

if ( eval "$comparision $examplecomparision)
{ print "exception created \n"; };

( I went experimenting ).

 

[KevinADC]

one possibility:

my $examplecomparison = "> 0.5";
my $comparison = 0.3;
my $x = qq~if ($comparison $examplecomparison) {print "exception created\n"} else {print "No Exception\n"}~;
eval $x;