#Barcode search code

A handheld scanner or barcode pen is moved across the code, or the code itself is moved by hand across a scanner built into a checkout counter or other surface. The numbers represented by a barcode are also printed out at its base.īarcode information is read by an optical ( laser) scanner that is part of a computer system. Most such codes use bars of only two different widths (thick and thin), though some codes employ four widths. The presence or absence of a bar of a particular width in a particular position in a sequence is read by the computer as either a 0 or 1. The bars are used to represent the binary digits 0 and 1, sequences of which in turn can represent numbers from 0 to 9 and be processed by a digital computer.

The bars are typically black on a white background, and their width and quantity vary according to application. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!īarcode, a printed series of parallel bars or lines of varying width that is used for entering data into a computer system.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.

#Barcode search how to

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