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That completes our tour of the fundamentals of programming, and now you re ready to take the next step. Everything you ve done so far is what s called procedural programming, but in 6, that s going to change. There s nothing wrong with procedural programming; in fact, most modern languages have their roots in procedural programming, and you ll probably find that you now can understand the fundamentals of other languages with procedural roots, such as Visual Basic and JavaScript. The basic data types you have to work with right now, though, form a somewhat short list you can do plenty of math, determine true or false, and work with text in the form of strings. That s a good start, but what if you want to model a somewhat more complex object with your code a dog, for example, or an employee, or a book You need a data type that s much more advanced, one that you define yourself. That s object-oriented programming, and that s the subject of the next chapter.

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The development of new programs requires testing, and this can place a database at great risk While it is possible to obtain a copy of the system for purposes of checking out programs, such a copy, especially if it requires many disk units, can be expensive to use Often the debugging of changes in a large system will disable normal operation of the system Earlier generations of programmers have tolerated the resulting impositions and often have worked at extremely awkward hours When we design a system today with the reliability features discussed above, we can include some features which can make it possible for programmers to rejoin the human race First we install a separate log le, a debug-log, on which transaction information about all debugging transactions is written Then we disable any output to permanent les or to regular user terminals for transactions being tested The needed output for checkout will be found on the debug-log When a transaction of a program in debug status requests a block, a list or hash table is checked to determine if this block was placed onto the current debug log, and if it was, the most recent copy is retrieved from the log by reverse scanning This debug-log approach is now available to IDS users While this practice will cause a slower response time for the debugging user, especially if the debug-log is maintained on tape, the system and human cost of such an approach will be immeasurably more reasonable It is possible to use the transaction log also for the debug log when testing Interference with normal operations will occur when a block written in debug mode has to be retrieved Any restoration has to ignore test transactions 11-5 A SCENARIO FOR RECOVERY

Question 5-1. What statements are generally used for conditional branching Question 5-2. True or false: an if statement s condition must evaluate to an expression. Question 5-3. Why should you use braces when there is only one statement following the if Question 5-4. What kind of expression can be placed in a switch statement Question 5-5. True or false: you can never fall through in a switch statement. Question 5-6. Name two uses of goto. Question 5-7. What is the difference between while and do...while Question 5-8. What are the three parts of a for loop header Question 5-9. What does the keyword continue do Question 5-10. What are two ways to create a loop that never ends until you hit a break statement

Exercise 5-1. Create a program that counts from 1 to 10 three times, using the while, do...while, and for statements, and outputs the results to the screen. Exercise 5-2. Create a program that prompts a user for input, accepts an integer, then evaluates whether that input is zero, odd or even, a multiple of 10, or too large (more than 100) by using multiple levels of if statements. Exercise 5-3. Rewrite the program from Exercise 5-2 to do the same work with a switch statement. Exercise 5-4. Create a program that initializes a variable i at 0 and counts up, and initializes a second variable j at 25 and counts down. Use a single for loop to increment i and decrement j simultaneously, and output the values of i and j at each iteration of the loop. When i is greater than j, end the loop and print out the message Crossed over!

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