This translates the characters into The process of bytes is called encoding. The storage of characters can be understood as a process of "translation", because the computer can only store byte data one by one and cannot recognize characters, so we need to translate the characters into byte data that the computer can understand. The second step is to perform the operation of 3 + (-2)Ĭharacters refer to the words and symbols used in the computer, such as 1, 2, 3, a, b, c, spaces, line breaks, punctuation marks, Chinese, Japanese, pictures, etc. 2's complement original => reverse => complement The first step is to turn the subtraction into a wig 3-2 into 3 + (-2)
The complement method shows the calculation process of 3-2 The computer expresses an integer value through the complement code, and the complement code is the inverted code plus 1 on the basis of the original code. let's take a look at the simplest data: integer, how it is represented in the computer. How does the computer pass 0? How about a long list of combinations with 1 to represent so much complicated data? 2.1 Integer storageġ. The computer can store various complex data such as numbers, letters, Chinese, special symbols, images, etc., but no matter what kind of data it is, it is ultimately represented by the underlying binary numbers (0 and 1). After receiving the response message, the POS terminal unpacks and obtains the final transaction result, and the whole process ends.Īmong them, grouping is the process of encoding, and unpacking is the process of decoding. After receiving the request in the background, it will unpack for verification, and after the verification is completed, repack and return a response message ģ.
Group the package according to the message format and initiate a transaction request to the background Ģ.
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