We are Intrested in EAN-13: EAN-13 (Wikipedia)
The input is a String of length 95 representing the barcode. Each databit (We are dealing with binary data) is displayed by a specified separator/character(mainly underscore or pipe characters) to represent the active bit and space to represent the dead bit. A separator is the bar area. The input may be reversed. You should decode the barcode so that the output was a String of length 13.
In case a barcode does not conform to the specifications, return (None -> Python) or (NULL -> C++).
The input final digit is the checksum. It is calculated from the other 12 digits, but in this mission it may be wrong. You must return (None -> Python) or (NULL -> C++) for this.
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Input: The separator character and the barcode String, (Note: The length of the barcode is fixed into 95 letters otherwise return None).
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Output: The decoded barcode number in a String format of length 13, None otherwise.
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Examples:
barcode_reader('_', "_ _ _ __ _ ___ __ __ _ __ ____ _ ___ _ _ _ __ __ __ __ _ _ _ ___ _ ___ _ _ _ _") => "5901234123457"
barcode_reader('_', "_ _ __ _ _ ___ ____ _ _ __ _ ___ ___ _ _ _ __ __ _ ___ _ ___ _ ___ _ _ _ _ _ _") => "4003994155486"- Finally: For Python: We implement this into a GUI using pygame that receives the input and generates the corresponding image if Barcode is true otherwise we raise a message-box error. For C++ I've never dealt with SFML so no clue how to implement it.