Use case diagram for ebook management system

Variables, functional and all kinds of data etc, that is set as protected, can be accessed from parent to child use case. Pay through credit card is a child use case.It means that some of the variables, functions are something else is inherited from parent to child. Place an order is the parent use case and pay through PayPal and pay through a credit card are child use cases. This diagram represents inheritance among use cases. The user can pay the bill by credit card or through Paypal. You need to develop a web-based application with the following functionalities Users can buy products online by placing the online order. But when a user adds friend then it must that user should first search the friend( included).Д®xample 2: Case Study 2 of Use Case Diagrams When a user searches a friend, then there is an option that the user adds a friend or not (extend). When the user gets a login, now there is a choice for the user, that the user can search a friend or not (extend). When the user gets a login, now there is a choice for the user, that the user can search a friend or not( extend). It totally depends on the choice of the user( extend).

When the user gets a login, now there is a choice for the user, that user can upload a profile picture or not. So we also draw a direct arrow from the user to login (extend). Once the user creates an account, now the user can log in every time without вЂњsignupвЂќ.

The direction of the arrow represents that вЂњregisterвЂќ is compulsory before вЂњloginвЂќ. So it means that register is a must to get a login (included). After register user can log in to the system. After searching a friend user can add friend.ДЇigure 1 represents the actions of a social website. The Registered user should also be able to search for a friend. After that, the user can log in to the system and can change his profile picture. You need to develop a social networking website with the following functionalities First of all, the user should create his account. Example 1: Case Study of Use Case Diagrams

Use case diagram for ebook management system