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Basic principles of software design

Modularity, abstraction and information hiding.

1, modularity: refers to the process of dividing a software system into several modules from top to bottom when solving a complex problem. Each module completes a specific sub-function, and all modules are assembled into a whole in a certain way.

2. Abstraction: it is a thinking tool used in the process of understanding complex phenomena, that is, to extract the common features of the essence of things without considering their details and other factors for the time being.

3. Information hiding: It means that when designing and determining a module, the information (process or data) contained in a module cannot be accessed by other modules that do not need this information.

上篇: Overview of diseases of neck and shoulder syndrome 下篇: Geography was the movement of the earth last semester in senior one. I don't understand, so it's hard to judge. Let me see the vernal equinox, autumnal equinox, summer solstice and winter solstice, the height of the sun and the direct point of the sun.