?? fig09_07.pl
字號:
#!usr/bin/perl
# Fig. 9.4: index.pl
# Demonstration of the index function
use warnings;
use strict;
my $string = "babaabababbaababbababababaaabblp";
print "We're going to number each bab.\n";
print $string, "\n";
my $foundAt = 0;
my $offset = 0;
my $label = 1;
my %positions;
while ( ( $foundAt = index( $string, 'bab', $offset ) ) > -1 ) {
$positions{ $foundAt } = $label++;
$offset = $foundAt + 1;
}
foreach ( 0 .. length( $string ) - 1 ) {
print $positions{ $_ } ? $positions{ $_ } : " ";
}
###########################################################################
# (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall. #
# All Rights Reserved. #
# #
# DISCLAIMER: The authors and publisher of this book have used their #
# best efforts in preparing the book. These efforts include the #
# development, research, and testing of the theories and programs #
# to determine their effectiveness. The authors and publisher make #
# no warranty of any kind, expressed or implied, with regard to these #
# programs or to the documentation contained in these books. The authors #
# and publisher shall not be liable in any event for incidental or #
# consequential damages in connection with, or arising out of, the #
# furnishing, performance, or use of these programs. #
###########################################################################
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