How to understand the position and function of "box" in high school mathematics
The block diagram is generally a multiple-choice or fill-in-the-blank question in the college entrance examination, with a score of 5 points. A little more difficult is the cyclic structure with more cycles, which is comprehensively investigated by series, but the block diagram gives a way to describe and deal with things. We only need to master three structures: sequence, selection and cycle.