Information is bit + context read for a deep understanding of computer systems

 

Our helloProgramIs from a source program (or source file). The source program is created and saved as a text file by the programmer through the editor. The file name is helloc. C. The source program is actually a bit sequence consisting of 0 and 1. These bits are organized into eight groups called bytes. Each byte represents a text character in the program.

Most modern systems use the ASC standard to Represent Text characters. In this way, each character is actually represented by a unique integer of the byte size. The ASC code representation of the hello. C program is provided.

Hello. C Programs are stored in files in byte sequences. Each byte has an integer corresponding to a character. For example, the integer of the first byte is 35, which corresponds to the character "#". The second integer is 105, and the corresponding character is "I", and so on. Note that each line of text ends with an invisible linefeed "\ n", and its corresponding integer is 10. Files like hello. C consisting of ASC characters are called text files, and all other files are called binary files.

Hello. the C representation method illustrates a basic idea: all the information in the system, including disk files, programs in the memory, user data stored in the memory, and data transmitted over the network, it is represented by a string of bits. The only way to differentiate different data objects is the context when we read these data objects. For example, in different contexts, the same byte sequence may represent an integer, floating point number, string, or its instructions.