【数据结构英文课件】PROGRAMMINGPRINCIPLES.pptVIP

requirements. Make sure that it meets the specifications. 6. Code the algorithm into the appropriate programming language. 7. Test and evaluate the program on carefully chosen test data. 8. Rene and repeat the foregoing steps as needed for additional functions until the software is complete and fully functional. 9. Optimize the code to improve performance, but only if necessary. 10. Maintain the program so that it will meet the changing needs of its users. 1.6.2 Problem Analysis 1. What form will the input and output data take? How much data will there be? 2. Are there any special requirements for the processing? What special occurrences will require separate treatment? 3. Will these requirements change? How? How fast will the demands on the system grow? 4. What parts of the system are the most important? Which must run most efficiently? 5. How should erroneous data be treated? What other error processing is needed? 6. What kinds of people will use the software? What kind of training will they have? What kind of user interface will be best? 7. How portable must the software be, to move to new kinds of equipment? With what other software and hardware systems must the project be compatible? 8. What extensions or other maintenance may be anticipated? What is the history of previous changes to software and hardware? 1.6.3 Requirements Specification 1. Functional requirements for the system: what it will do and what commands will be available to the user. 2. Assumptions and limitations on the system: what hardware will be used for the system, what form the input must take, the maximum size of input, the largest number of users, and so on. 3. Maintenance requirements: anticipated extensions or growth of the system, changes in hardware, changes in user interface. void Life :: update( ) Pre: The Life object contains a con