International Platform on Barcode GS1 http://www.gs1.org/ TOBB's website for information about barcodes in Turkey http://gs1.tobb.org.tr/index.php Detailed Information About Barcode http://www.barcodeisland.com/syminfo.phtml#Background     Conversion of numbers into bars The basic working principle is to detect empty and filled spaces between the bars.There are numbers under the bars that are readable only for humans and are actually for humans to check.While barcode printers convert numbers into rods, barcode readers also convert rods into numbers, according to the same industrial rules.Barcodes may also contain letters and some signs, depending on their type.2D barcodes have a larger 'capacity' to contain different information.EAN-13 and EAN-8 are widely used in our country. When we look at barcodes, they seem to consist of complex lines, while the bar groups corresponding to each number are formed with the same logic.When the numbers we see with our eyes are converted to binary, they will be converted into 0s and 1s.For example, 7 is represented as 1011 in binary, which causes it to be displayed as line-space-line-line.That is, the space and the thin line correspond to 0s and 1s.1's that fall next to each other turn into thicker lines.In order to correctly code barcodes of different sizes, there are alignment lines at the beginning and in the middle to indicate the length of the barcode. These may attract your attention because they are usually shown longer. Barcodes are used for similar products.It is used in sales transactions, warehouse movements, accelerating processes and minimizing user errors.It is also used in areas such as warehouse layout codes, cargo packages, customer cards.There are different barcode types depending on the sector in which they are used: Numeric ones EAN-8: 8-digit EAN structure JAN: EAN structure used in Japan UPC-A: 12-character structure used in the USA UPC-E: 6-digit UPC Letters and numbersCode 128: Providing extensive information, international use. EAN 128: Mailing and product information. Code 39: US government and military use.If we look at the sections that we can symbolize as ÜÜÜFFFFSSSSSC, ÜÜÜIt consists of 3 digits country code, FFFF 4 digits manufacturer company code, SSSSSS 5 digits product code, C 1 digit 'check digit'. Market Scale ProductsIn the EAN-13 standard, codes 20-29 are reserved for internal use.With these two digits, you have a total of 7 digits.It defines.After adding the weight or quantity values ​​to the next 5 digits, the scales also calculate the check digit, resulting in a barcode in accordance with the EAN-13 structure.When giving codes to products, it is widely practiced to divide the first two digits into product groups such as fruits, vegetables and fish.Thus, the general practice in our country is that 7-digit codes consisting of 20-digit codes and 5-digit product codes are defined as barcodes on stock cards in back offices. Calculation of the Check Digit The check digit, which corresponds to the English 'check digit', helps readers to be sure of the values they read.It is an application made for.Starting from the 12 digits, he compares the number he calculated according to the formula below with the 13th digit he read using the normal method. Starting from the rightmost check digit to the end, we add the values ​​of the odd numbered digits and multiply them by 3.Then, we directly add the even-numbered digits that we skipped when taking the first total to this total.The number we gotThe difference between n and the nearest number ending in 0 is the check digit.Readers also use this formula.By comparing the number he found with the 13th digit he read, he becomes sure of his reading result.This is where the name check digit comes from. ÖFor example, let's try to find the check digit that is X for 869123412345X.First of all, the 869 value at the top left is used for the country code.We skip X and get 5+3+1+3+1+6 = 19 3¨Country Codes  00-13: USA &Canada 20-29: In-Market Use 30-37: France 40-44: Germany 45: Japan (also 49) 46: Russian Federation 471: Taiwan 474: Estonia 475: Latvia 477:Lithuania 479: Sri Lanka 480: Philippines 482: Ukraine 484: Moldova 485: Armenia 486: Georgia 487: Kazakhstan 489: Hong Kong 49: Japan (JAN-13) 50: UnitedKingdom 520: Greece 528: Lebanon 529: Cyprus 531: Macedonia 535: Malta 539: Ireland 54: Belgium &Luxembourg 560: Portugal 569: Iceland 57: Denmark 590: Poland 594: Romania 599: Hungary 600 &601: South Africa 609: Mauritius 611: Morocco 613: Algeria 619: Tunisia 622: Egypt 625: Jordan626: Iran 64: Finland 690-692: China 70:Norway 729: Israel 73: Sweden 740: Guatemala 741: El Salvador 742: Honduras 743: Nicaragua 744: Costa Rica 746: Dominican Republic 750: Mexico 759:Venezuela 76: Switzerland 770: Colombia 773: Uruguay 775: Peru 777: Bolivia 779: Argentina 780: Chile 784: Paraguay 785: Peru 786: Ecuador 789: Brazil 80 - 83: Italy 84: Spain 850: Cuba 858: Slovakia 859: Czech Republic 860: Yugloslavia 869: TURKEY 87:Netherlands 880: South Korea 885: Thailand 888: Singapore 890: India 893: Vietnam 899: Indonesia 90 &91: Austria 93: Australia 94: New Zealand 955: Malaysia 977: International Standard Serial Number for Periodicals (ISSN) 978: International Standard Book Numbering (ISBN) 979: International Standard Music Number (ISMN) 980: Refund receipts 981 &982: Common Currency Coupons 99: Coupons