Skip to Main Content
Learning Perl, 5th Edition
book

Learning Perl, 5th Edition

by Randal L. Schwartz, Tom Phoenix, brian d foy
June 2008
Beginner content levelBeginner
352 pages
11h 16m
English
O'Reilly Media, Inc.
Content preview from Learning Perl, 5th Edition

Bitwise Operators

When you need to work with numbers bit by bit, as when working with the mode bits returned by stat, you’ll need to use the bitwise operators. These are the operators that perform binary math operations on values. The bitwise-and operator you’ll need to use the bitwise operators. These are the operators that perform binary math operations on values. The bitwise-and operator (&) reports which bits are set in the left argument and in the right argument. For example, the expression 10 & 12 has the value 8. The bitwise-and needs to have a 1-bit in both operands to produce a one-bit in the result. That means that the logical-and operation on 10 (which is 1010 in binary) and 12 (which is 1100) gives 8 (which is 1000, with a 1-bit only where the left operand has a 1-bit and the right operand also has a 1-bit). See Figure 12-1.

Bitwise-and addition

Figure 12-1. Bitwise-and addition

Examples of the bit operators are shown inTable 12-2.

Table 12-2. Bitwise operators

Expression

Meaning

10 & 12

Bitwise-and—which bits are true in both operands (this gives 8)

10 | 12

Bitwise-or—which bits are true in one operand or the other (this gives 14)

10 ^ 12

Bitwise-xor—which bits are true in one operand or the other but not both (this gives 6)

6 << 2

Bitwise shift left—shift the left operand the number of bits shown by the right operand, adding zero-bits at the least-significant places (this gives 24)

25 >> 2

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Learning Perl, 6th Edition

Learning Perl, 6th Edition

Randal L. Schwartz, brian d foy, Tom Phoenix
Beginning Perl

Beginning Perl

Curtis Ovid Poe
Learning Perl 6

Learning Perl 6

brian d foy
Mastering Perl

Mastering Perl

brian d foy

Publisher Resources

ISBN: 9780596520106Supplemental ContentErrata Page