A Binary code is a way of representing text or computer processor instructions by the use of the binary number system's two-binary digits 0 and 1.
So the purpose of binary code is to issue human readable code, changed to machine code (binary) that the computer understands and can execute the instructions.
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Binary codes are used for coding data so that it can be simply read and executed. The first form of binary code recorded is the Chinese text I Ching, and one of the most common daily uses of binary code, besides computers, is Braille.
a binary code is self complementary if complement of any code word is again a code .in self completing codes 9's complement of a number can be obtained by interchanging 0's and 1's.
With that big old '5' in there, this can't be a binary number. A binary number is written with only 2 symbols. They're usually represented as '0' and '1', but they can be any two different marks. The number in the question has 3 different marks.
binary 0 1
The earliest computers were literally hardwired using logic gates that determined combinations of on/off values over various wires to determine the program. Even once programming moved from hardware to software, binary codes remained the basis of all programming languages.
There are many reasons a MasterCard uses secure codes. The most significant reason is for the cardholder's privacy and security. One's financial information is very important.