June 2005
Beginner
480 pages
10h 31m
English
Content preview from SAMS Teach Yourself Perl in 24 Hours THIRD EDITION
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Exercise: Finding the Bug
This exercise shows you how to use the debugger. The program in Listing 12.1 has a problem—actually two. It's supposed to print these messages:
20 glasses of Lemonade on the wall 19 glasses of Lemonade on the wall : 1 glass of Lemonade on the wall 0 glasses of Lemonade on the wall
But it does not. Your task is to type the program in Listing 12.1 and try to find the bugs. Neither of the bugs is a syntax problem—Perl's warnings are not triggered, and use strict prints no messages—but the debugger should make the bugs fairly obvious to find.
After you type the program, run Perl with the debugger to try to find the errors. Remember to print relevant variables and expressions occasionally and step through the function calls ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.