Given something like the following:
my @variables = [3, 7, 13, 4, 12];
my @tests = ("2*a+b==c", "c-d+a==e");
I need to be able to evaluate the mathematical truth of the tests, using the
values from @variables, where $variable[0] holds the value of the
variable 'a', $variables[1] holds the value of 'b', etc. I can do the
evaluation but how do I (reasonably efficiently) substitute the values into
the strings? (The length of the array and the exact tests are not known
until run time.)
In C, I'd do this by walking through the test strings character by character,
checking for isalpha, converting the character to its ascii value and
subtracting the ascii value of 'a', and indexing into the array. In Perl I'm
not sure how to do this type of low level character by character processing.
The only thing which occurs to me is to split() the string into an array of
characters, then walk through that array. Am I on the right track or is
there an easier way to do this in Perl?
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
<http://learn.perl.org/> <http://learn.perl.org/first-response>
