Section 4.5 if Single-Selection Statement
• Programs use selection statements to choose among alternative courses of action.
• The single-selection if statement’s activity diagram contains the diamond symbol, which indicates that a decision is to be made. The workflow follows a path determined by the symbol’s associated guard conditions (p. 106). If a guard condition is true, the workflow enters the action state to which the corresponding transition arrow points.
• The if statement is a single-entry/single-exit control statement.
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