The logical organization of the file's logical structure files is for the convenience of users. The logical structure of a general file can be divided into two types: the non interface character stream file and the constructed record file. The records are made up of records, that is, the information in the document is divided into several records, which are used to record and organize information for units. Record files are divided into sequential files, indexed sequential files, index files and direct Files 1, sequential files. Most files are sequential files. The length of records and the type and length of data items in records.
First, the program control mode is divided into unconditional query and program inquiry mode. 1, unconditional delivery mode, I/O port is always ready to accept the output data of the host, or always ready to input data to the host, and CPU, when needed, directly uses I/O instructions to access the I/O port of the response at any time, and realizes data exchange with the peripheral. The advantage is that the hardware and software structure is simple, and the shortcoming is that it requires high time sequence and is only suitable for simple I/O control. 2, program query method, also known as program polling, this way...
Storage management logic address: address generated by CPU. Logical addresses are internal and programming, not unique. For example, if you do C pointer programming again, you can read the pointer variable itself (and operation). In fact, this value is the logical address. The tower is relative to the address (offset address) of your current process data, and does not want to do with the absolute force address. Physical address: the address loaded into the memory address register, the real address of the memory unit. Static relocation: in the process of program execution.
Operating system functions 1, processor management 2, memory management 3, device management 4, file management 5, user management operating system type 1, single user system: one processor supports only one user program 2, batch processing system: after users submit a batch of operations to the operating system, they no longer interfere, and the operating system controls them to run automatically, and the human-machine does not interact. 3, time-sharing operating system: the running time of the processor is divided into very short time slices, and the processors are allocated to each online operation in turn according to the time slice. 4, net...
The basic concepts of programming language 1, low-level language: 0 or 1 of the machine instruction sequence or assembly language 2, high-level language: Java, C, c++, Python, Delphi, PASCAL3, compiler: translate source program into target language program, then run the target program on the computer. 4. Interpretation procedure: direct explanation or translation into intermediate code. No independent target program is generated. Compiler principle 1, lexical analysis phase: input source program, to constitute the source.
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