music

Boolean Exclusive OR (XOR)

summary

This subchapter looks at Boolean exclusive OR (XOR).

free computer programming text book project

If you like the idea of this project,
then please donate some money.

stub section

This subchapter is a stub section. It will be filled in with instructional material later. For now it serves the purpose of a place holder for the order of instruction.

Professors are invited to give feedback on both the proposed contents and the propsed order of this text book. Send commentary to Milo, PO Box 1361, Tustin, California, 92781, USA.

Boolean Exclusive OR (XOR)

This subchapter looks at Boolean exclsuive OR (XOR).

XOR

XOR (or exclusive or) is similar to the normal English meaning of the word “or” — a choice between two items, but not both or none. XOR is less commonly written EOR. The symbol for the XOR operation is .

The truth table for XOR (exclusive OR) is as follows:

XOR
ABresult
000
101
011
110

The XOR gate in logic circuits looks like:

XOR is not considered to be a basic Boolean operation, but is widely used in logic expressions. XOR is the same as ( (A) · (¬B) ) + ( (¬A) · (B ) ), extra parenthesis added for clarity.

assembly language instructions

Logical instructions typically work on a bit by bit basis, although some processors use the entire contents of the operands as whole flags (zero or not zero input, zero or negative one output). Typical logical operations include logical negation or logical complement (NOT), logical and (AND), logical inclusive or (OR or IOR), and logical exclusive or (XOR or EOR). Logical tests are a comparison of a value to a bit string (or operand treated as a bit string) of all zeros. Some processors have an instruction that sets or clears a bit or byte in registers or memory based on the processor condition codes.

• XOR Exclusive OR; DEC VAX; performs a logical exclusive OR of the bit mask (first operand, register or memory) with the source (second operand, register or memory), available in two operand (results stored in second operand) and three operand (results stored in third operand) (XORB2 exclusive or byte 2 operand, XORB3 exclusive or byte 3 operand, XORW2 exclusive or word 2 operand, XORW3 exclusive or word 3 operand, XORL2 exclusive or longword 2 operand, XORL3 exclusive or longword 3 operand); sets or clears flags
• EOR Exclusive Or Logical; Motorola 680x0, Motorola 68300; performs a logical exclusive or (XOR) of a source operand with a destination operand and stores the result in the destination operand (8, 16, or 32 bits), one of the two operands must be a data register, the other operand can be the contents of any register or memory location; sets or clears flags
• EORI Exclusive Or Immediate; Motorola 680x0, Motorola 68300; performs a logical exclusive or (XOR) of the contents of a register or memory location (8, 16, or 32 bits) with an immediate; sets or clears flags
• XOR Logical Exclusive OR; Intel 80x86; performs a logical exclusive OR between two registers, a register and contents of a memory location, or an immediate operand and either the contents of a register or the contents of a memory location; byte (8 bits), word (16 bits), or doubleword (32 bits); sets or clears flags

free music player coding example

Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).

View music player in action: www.musicinpublic.com/.

Create your own copy from the original source code/ (presented for learning programming).

view text bookHTML file

Because I no longer have the computer and software to make PDFs, the book is available as an HTML file, which you can convert into a PDF.

 previous page next page
 Tweets by @osdata

free computer programming text book project

Building a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming.

If you like the idea of this project,
then please donate some money.

send donations to:
Milo
PO Box 1361
Tustin, California 92781

Supporting the entire project:

If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church)

Some or all of the material on this web page appears in the
free downloadable college text book on computer programming.

This web site handcrafted on Macintosh computers using Tom Bender’s Tex-Edit Plus and served using FreeBSD .

†UNIX used as a generic term unless specifically used as a trademark (such as in the phrase “UNIX certified”). UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.

Names and logos of various OSs are trademarks of their respective owners.