tailieunhanh - software engineering ian sommerville 8th edition phần 8

mà bạn tạo ra nó, hiệu quả làm cho một trang đánh dấu vào container. Nhà điều hành + = và điều hành-= chức năng thành viên cho phép bạn di chuyển một iterator bằng một số điểm, trong khi vẫn tôn trọng ranh giới của container. Tăng quá tải và khai thác lượng giảm di chuyển iterator một nơi. | 588 Chapter 24 B Critical systems validation ii If the radiation level in a room is below a specified value the door may be opened by an authorised operator. iii An authorised operator is identified by the input of an authorised door entry code. The Java code shown in Figure controls the door-locking mechanism. Note that the safe state is that entry should not be permitted. Develop a safety argument that shows that this code is potentially unsafe. Modify the code to make it safe. Using the specification for the dosage computation given in Chapter 10 Figure write the Java method computeinsulin as used in Figure . Construct an informal safety argument that this code is safe. Suggest how you would go about validating a password protection system for an application that you have developed. Explain the function of any tools that you think may be useful. Why is it necessary to include details of system changes in a software safety case List four types of systems that would require system software safety cases. Assume you were part of a team that developed software for a chemical plant which failed in some way causing a serious pollution incident. Your boss is interviewed on television and states that the validation process is comprehensive and that there are no faults in the software. She asserts that the problems must be due to poor operational procedures. A newspaper approaches you for your opinion. Discuss how you should handle such an interview. What are the arguments for and against the licensing of software engineers Figure Door lock controller 1 entrycode 0 2 if entryCode lock-authorisedCode 3 4 shieldstatus Shield-getStatus 0 5 radiationLevel 0 6 if radiationLevel dangerLevel 7 state safe 8 else 9 state unsafe 10 if shieldstatus 11 state safe 12 if state safe 13 14 false 15 0 16 17 else 18 19 20 true 21 22 It is .