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1. How does a phased life cycle model assist software management The phased life cycle improves the visibility of the project. The project can be managed by using the phases as milestones. More detailed phases will allow closer monitoring of progress. 2. What are the two required characteristics of a milestone A milestone (1) must be related to progress in the software development and (2) must be obvious when it has been accomplished. 3. Documents in the software life cycle: Final user manual Architectural design SQA plan Module speci cation Source code Statement of work Test plan Preliminary user manual Detailed design Cost estimate Project plan Implementation phase Design phase Project planning phase Design phase Implementation phase Feasibility phase Requirements phase Requirements phase Design phase Project planning phase Project planning phase

Example 4.14 illustrates an input function. The while ( 1) control of the loop in this example makes it look like an infinite loop: the condition ( 1) is always true. But the loop is actually controlled by the return statement which not only terminates the loop but also terminates the function.

Here is a simple function that prompts the user for his/her age and then returns it. It is robust in the sense that it rejects any unreasonable integer input. It repeatedly requests input until it receives an integer in the range 1 to 120: int age0 { int n; while (1) { tout << "How old are you: '; tin >> n; if (n c 0) tout << "\a\tYour age could not be negative.'; else if (n > 120) tout CC "\a\tYou could not be over 120."; else return n; tout << "\n\tTry again.\n";

As soon as the input received from tin is acceptable, the function terminates with a return statement, sending the input back to the calling function. If the input is not acceptable (n c 0 or n > 12 0), then the system beep is sounded by printing the character I\a I and a comment printed. Then the user is asked to Try again. Note that this is an example of a function whose return statement is not at the end of the function. Here is a test driver and output from a sample run: // Prompts the user to input her/her age, and returns that value:' i n t age(); // Test driver for the age0 function: main0 1 int a = age(); tout << "\nYou are ' << a << ' years old.\n"; > Your age could not' Jx.2 negative* Try again, .,. " Eiuw old ax you: 200

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On the Internet in general, and for the Extensible Markup Language (XML) world in particular, there s a strong emphasis on security to ensure the privacy and con dentiality of communications on a public medium, and also to protect the integrity of electronic business transactions These broad concerns help explain why several working groups at the World Wide Web Consortium (W3C) are currently working on a variety of security initiatives These include the XML Signature recommendation, which covers use of digital signatures to ensure document integrity, to provide message authentication, and to support signer authentication services They also include work underway on an XML Encryption initiative; its job is to de ne strong encryption/decryption services for XML documents, and the XML Key Management working group; its job is to de ne simple client access to public key data.

Test report Documentation 4. Order of tasks:

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Notice that the function s parameter list is empty. But even though it has no input parameters, the parentheses! ( ) must be included both in the function s header and in every call to the function.

Market analysis Project planning, cost estimating, requirement speci cation (may be done concurrently) Requirements review High-level design Low-level design Design review Implementation Unit testing Systems testing Acceptance testing 5. Draw a diagram that represents an iterative life cycle model. See Fig. 1-2.