Beefy Boxes and Bandwidth Generously Provided by pair Networks
Welcome to the Monastery
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
The XOR operator works just like the bitwise NOT operator (~) because it flips bits, but it takes two inputs. Input number 1 determines which bits will be negated in input number 2:

For example, 0000 ^ 0000 will simply leave all the bits zero.
1111 ^ 0000 will flip all the bits, so they become 1111.
1000 ^ 0000 will flip only the first bit and leave the rest unchanged. Result: 1000
1110 ^ 1101 will flip the first three bits and leave the last one unchanged. Result: 0011

The AND operator turns specific bits OFF. It takes two input numbers. The bits in input number 1 determine which bits in input number will be turned off. The ones that are zero will be turned off. Here is an example:

1001 ^ 0110 = 0000
1100 ^ 0111 = 0100
0000 ^ 1111 = 0000
1000 ^ 1111 = 1000

See, this is really simple. Here is a tiny example program:

#!/usr/bin/perl -w use strict; use warnings; $a = 4; print "\n ORIGINAL = $a"; $a &= 0xFFFB; # 0xFFFB = 1111111111111011 binary print "\nCLEAR BIT = $a"; $a |= 4; print "\n SET BIT = $a"; print("\n XOR BIT = ", ($a ^ 0)); print("\n XOR BIT = ", ($a ^ 0xF)); exit;

In reply to Re: How can I set a bit to 0 ? by harangzsolt33
in thread How can I set a bit to 0 ? by bartender1382

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others avoiding work at the Monastery: (4)
As of 2024-03-28 21:07 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found