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SAMS Teach Yourself Perl in 24 Hours THIRD EDITION
book

SAMS Teach Yourself Perl in 24 Hours THIRD EDITION

by Clinton Pierce
June 2005
Beginner
480 pages
10h 31m
English
Sams
Content preview from SAMS Teach Yourself Perl in 24 Hours THIRD EDITION

Workshop

Quiz

1:What were the bugs in the Listing 12.1?
2:If no files are given on the command line, reading <> returns
  1. undef

  2. lines from standard input

  3. True

3:The Perl debugger can print Perl statements as they execute. This is called trace mode. How do you put the debugger into trace mode? (Hint: You need to look at the debugger's help message for this answer.)
  1. Use the T command, for trace

  2. Use the t command, for trace

Answers

A1: First, in line 15 the range (20..0) is not valid. The range operator—..—does not count down, only up. This line should be changed to a for($_=20; $_>-1; $_--) loop, reverse(0..20) or something similar. Second, at line 10 the $mess=s/glasses/glass/ looks like a substitution on $mess, but it's not. The substitution is actually ...
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Publisher Resources

ISBN: 0672327937Purchase book