Learn in the textbookControl Structures and Notation Methods
DefinitionA flow diagram (流れ図) shows processing steps as standard symbols joined by arrows (flow lines).
ExplanationThe main symbols include, for example, the terminal (端子) for start and end, the process (処理) for calculations, the decision (判断) that splits the path by a condition, and the loop limit (ループ端) placed above and below the repeated range. The basic reading direction is top to bottom and left to right, and arrows mark any other direction. The three basic control structures appear as symbols linked vertically, as a split at a decision, and as a range enclosed by loop limits (or an arrow from a decision back upward).
AnalogyIt is like a route map that marks forks and detours with fixed symbols and uses arrows to show which way to go.