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Barcodes are used for entering data into a computer system. The bars represent the binary digits 0 and 1, just like basic computer language, and sequences of these digits can indicate the numbers from 0 to 9, which can then be read by an optical laser scanner and processed by a digital computer. Arabic numbers appear below the code.

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The traditional bar code has been used to monitor skiers at ski lifts and to determine price and perform inventory control on groceries, drugs, medical supplies, manufactured parts and library books to name a few.
The bar code used on grocery products, introduced in the 1970s, is called a universal product code (or UPC) and assigns each type of food or grocery product a unique code.

The five digits on the left are assigned to a particular manufacturer or maker and the five digits on the right are used by that manufacturer to identify a specific type or make of product. Traditional single dimension bar codes are not readily customizable because there is little extra space.

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The two-dimensional bar code, with an information density of 1,100 bytes, allows a considerably greater amount of information to be coded than does the traditional bar code, including customized information. It also has built-in redundancy, meaning that the identical information is duplicated on the same code. Therefore, if the code is damaged, it can still be read. The technology even allows pictures or text to be contained within the code, as well as barcode encryption.

The new technology dramatically reduces the errors of the single dimensional bar code and reduces the enormous costs that some companies have reported in the past.

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5. Which of the following can be a UPC symbol?

A. A code with five digits on the left, five on the right, two different widths, and one number under each.
B. A code with six digits on the left, four on the right, two different widths, and one roman numeral under each.
C. A code with five digits on the left, five digits on the right, five or six different widths, and one number under each.
D. A code with five digits on the left, five digits on the right, reverse from (white text on black background), and no number under.
E. A code with six digits on the left, four on the right, two different widths, and one number under.

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6. The author implies that the bar code....

A. Has become popular since several decades
B. Will never change
C. Is not useful
D. Has existed in one-dimensional form for years.
E. Is damaged

7. The author’s main purpose is to describe....

A. the current technology and newest innovation of bar codes.
B. problems with the bar code.
C. The UPC used in grocery stores.
D. Why the bar code is no longer viable.
E. Information density.