raw a sequence diagram to represent the scenario of "using vending machine to purchase drinks". Four objects have been defined as follows. Add the ollowing functions: (1) change when the customer pays more than the price of the purchased beverage; (2) return the customer's payment if the purchased everage has been sold out, otherwise, it will be sold normally. Draw a complete sequence diagram showing the above functions. Customer Front Register Dispenser

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Requirement Analysis

A process that determines the user expectations for a software product is called requirement analysis. In software engineering, requirement analysis is known as requirement engineering. It involves communication with end-users and stakeholders to determine whether the system or software requirements are validated, conflicts are solved, and key requirements are documented. The first activity of the Software Development Life Cycle (SDLC) is requirement analysis.