By Barry B. Brey
A text/reference on all programming and interfacing elements of the microprocessor kinfolk, for computing device technological know-how scholars. Early chapters pay attention to actual mode programming, and later chapters comprise details on each one loved one and on programming and operation at the numeric coprocessor as we.
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The environment variables PERLIO, PERL_ENCODING, and PERL_UNICODE all give Perl various sorts of hints related to these matters. 1 Accessing Substrings Problem You want to access or modify just a portion of a string, not the whole thing. For instance, you’ve read a fixed-width record and want to extract individual fields. Solution The substr function lets you read from and write to specific portions of the string. $value = substr($string, $offset, $count); $value = substr($string, $offset); substr($string, $offset, $count) = $newstring; substr($string, $offset, $count, $newstring); # same as previous substr($string, $offset) = $newtail; The unpack function gives only read access, but is faster when you have many substrings to extract.
So ||= is used to set a variable when that variable is itself still false. Since the || check is a simple Boolean one—testing for truth—it doesn’t care about undefined values, even when warnings are enabled. Establishing a Default Value This is the Title of the Book, eMatter Edition Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved. | 11 Here’s an example of ||= that sets $starting_point to "Greenwich" unless it is already set. Again, we assume $starting_point won’t have the value 0 or "0", or that if it does, it’s okay to change it.
Thank you all. xxxiv | Preface This is the Title of the Book, eMatter Edition Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved. Chapter 1 CHAPTER 1 Strings He multiplieth words without knowledge. 0 Introduction Many programming languages force you to work at an uncomfortably low level. You think in lines, but your language wants you to deal with pointers. You think in strings, but it wants you to deal with bytes. Such a language can drive you to distraction. Don’t despair; Perl isn’t a low-level language, so lines and strings are easy to handle.
The Intel Microprocessors: 8086 8088, 80186 80188, 80286, 80386, 80486 - Pentium and Pentium Processor - Architecture, Programming and Interfacing (Prentice Hall International Editions) by Barry B. Brey