by 
Anonymous
ANSWERS: 3
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When you use scan a library book it looks at each indvidual line. and that tells the computer what book it is.
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Barcodes have an alphabet of dots and dashes. These are represented as thin bars and wide bars separated by white space. UPC barcodes are one type of code. There are many others. A specific code is called a symbol set or symbology. In the UPC code, only the digits 0-9 are represented. Letters are not allowed. Each digit is represented as a specific pattern of thin and wide bars. (See UPC Specification) Barcodes are “read” by a device called a “reader” or “scanner”. These devices use reflected light off the barcode symbol to measure the widths of the bars and spaces.
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it probably tells what book you borrowed
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