more clearer , still avoid string-eval

#!/usr/bin/perl --
use strict; use warnings;
my $blah  = q{-0.137 + (0.00479 / (W/0.9)) + (2.5593 * (W/0.9 ) ,0.045
+,0 };
print EvalPolynominal( $blah, 1,1 );
sub EvalPolynominal {
    #first parameter gives the polynominal string
    #second parameter gives the min-des width
    #third parameter gives the short-line length
    
    my $polynominal = shift;
    my $curWidth    = shift;
    my $curLength   = shift;
    
    $polynominal =~ s/W/$curWidth/g ;#replace W with current value of 
+min width
    $polynominal =~ s/L/$curLength/g ;#replace L with current value of
+ min Length
    local $@;
    my $ret = eval $polynominal;
    warn "Trying:\n\t$polynominal\nbut got: $@\n" if $@;
    return $ret;
}
__END__

$ perl -we "  -0.137 + (0.00479 / (1/0.9)) + (2.5593 * (1/0.9 ) ,0.045
+,0 "
syntax error at -e line 1, at EOF
Execution of -e aborted due to compilation errors.

$ perl blah
Trying:
        -0.137 + (0.00479 / (1/0.9)) + (2.5593 * (1/0.9 ) ,0.045,0
but got: syntax error at (eval 1) line 2, at EOF

Use of uninitialized value in print at blah line 4.

$ perl -we "  -0.137 + (0.00479 / (1/0.9)) + (2.5593 * (1/0.9 ) ,0.045
+,0 "
syntax error at -e line 1, at EOF
Execution of -e aborted due to compilation errors.
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.