Flush() uses getchar() to read characters from the input buffer until it reads in a carriage in Java

Make Data Matrix ECC200 in Java Flush() uses getchar() to read characters from the input buffer until it reads in a carriage

Flush() uses getchar() to read characters from the input buffer until it reads in a carriage
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return. Flush() is a good utility routine to have around.
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/*****************************************> Flush <*/ void Flush( void ) { while ( getchar() != '\n' ) ; }
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NOTE
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Flush() was based on the Standard Library function fflush(). fflush() flushes the input buffer associated with a specific file. Since we haven t gotten into files yet, we wrote our own version, which as you can see, wasn t very hard.
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CHAPTER 9: Designing Your Own Data Structures
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What s Next
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This chapter covered a wide range of topics, from #include files to linked lists. The intent of the chapter, however, was to attack a real-world programming problem in this case, a program to catalog DVDs. This chapter showed several design approaches, discussing the pros and cons of each. Finally, the chapter presented a prototype for a DVD-tracking program. The program allows you to enter information about a series of DVDs and, on request, will present a list of all the DVDs tracked. One problem with this program is that once you exit, all of the data you entered is lost. The next time you run the program, you have to start all over again. 10 offers a solution to this problem. The chapter introduces the concept of files and file management, showing you how to save your data from memory out to your hard disk drive and how to read your data back in again. The next chapter updates dvdTracker, storing the DVD information collected in a file on your disk drive.
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CHAPTER 9: Designing Your Own Data Structures
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CHAPTER 9 EXERCISES
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1. What s wrong with each of the following code fragments a. struct Employee {
char int }; name[ 20 ]; employeeNumber
b. while ( getchar() == '\n' ) ; c. #include "stdio.h" d. struct Link {
name[ 50 ]; Link }; *next;
e. struct Link {
struct Link } next; struct Link prev;
f. StepAndPrint( char *line ) {
while ( *line != 0 ) line++; printf( "%s", line ); }
2. Update dvdTracker so it maintains its linked list in order from the lowest rating to the highest rating. If two DVDs have the same rating, the order is unimportant. 3. Update dvdTracker to add a prev field to the DVDInfo struct so it maintains a doubly linked list. As before, the next field will point to the next link in the list. Now, however, the prev field should point to the previous link in the list. Add an option to the menu that prints the list backward, from the last struct in the list to the first.
Working with Files
hapter 9 introduced dvdTracker, a program designed to keep track of your DVD collection. dvdTracker allowed you to enter a new DVD, as well as list all existing DVDs. dvdTracker s biggest shortcoming was that it didn t save the DVD information when it exited. If you ran dvdTracker, entered information on ten DVDs and then quit, your information would be gone. The next time you ran dvdTracker, you d have to start from scratch. The solution to this problem is to somehow save all of the DVD information before you quit the program. This chapter will show you how; it introduces the concept of files, the long-term storage for your program s data. We ll start off with the basics, learning how to open and read a file and displaying its contents in the console window. Next, you ll learn how to write data out to a file. Finally, you ll learn about a variety of file opening modes that give you more options when dealing with files.
NOTE
As you move on to other programming languages (such as Objective-C, Java, or C++), sophisticated development toolkits (such as Cocoa), and even other operating systems, you ll find there are many ways to work with files. Most of them are based on the concepts you ll learn in this chapter. Stay with the program! Learn the basics, and you ll find moving on to other development platforms much, much easier in the long run.
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