Barcode is collection of lines representing information about the product on which it is attached. The barcode contains optical machine readable data. The information or data is in the different width, spacing of the lines. Originally, the barcodes were in lines and were linear. Later one dimensional and two dimensional codes were developed. These codes were in rectangles, dots, hexagons and geometry patterns. All the codes can be read only with the barcode reading devices. Now, the software to read the barcodes also comes in Smartphones. Types of bar codes – Barcodes can be divided into numeric only, alpha numeric only or 2 dimensional codes. Code 39 can be of any length and has large number of characters enclosed in it. This bar code has upper case letters , digits and some special characters space , minus , period , dolor sign , percentage , plus and slash . This code 39 can be extended by encoding several other characters like lowercase letters and additional symb
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