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That s some pretty powerful stuff. This would take a whole bunch of code in C (you would have to open the file, read blocks of data, append to a string, make sure the trailing zero-byte is in the right place, and close the file). For us Objective-C devotees, it becomes a single line of code. Nice.

if(sqlite3_finalize(statement) != SQLITE_OK)

375% 300% 225% 150% 1050% 335%

if (sqlite3_close(database) != SQLITE_OK)

Let s revisit CarParts, last seen in 6 when we broke out each class into its own source file. This time, we ll add some initialization goodness to the Tire class and clean up Car s memory management along the way. For those of you following along at home, the project directory that has the finished program for this chapter is 10.01 CarPartsInit, or 10.01 CarPartsInit-GC for a garbage-collected version.

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Selecting all records only has limited value Rarely will you use SQL statements where you do not wish to limit the results returned For this, you typically add parameters to your SQL statements and then replace the parameters with values in your program This is called binding your program s values to the statements parameters Programs usually also allow more than simply selecting data; most applications allow users to add, edit, and delete records In the next section, you learn about binding, inserting, updating, and deleting records

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Tires in the real world are more interesting creatures than the ones we ve simulated in CarParts so far. In your real tires, you have to keep track of the tire pressure (don t want it to get too low) and the tread depth (once it goes below a couple of millimeters, the tires aren t safe anymore). Let s extend Tire to keep track of the pressure and tread depth. Here s the class declaration that adds two instance variables and the corresponding accessor methods:

Although you can t declare a function private, you can declare a function static But a static function in C is very different from a static function in Java In C, declaring a function static is similar to declaring a function private in Java In C, only functions declared in the same file can use a function declared static Static functions are useful for utility functions that won t be used elsewhere in a program

static void sayHello(void){ printf("hello\n");}

#import <Cocoa/Cocoa.h> @interface Tire : NSObject { float pressure; float treadDepth; } - (void) setPressure: (float) pressure; - (float) pressure; - (void) setTreadDepth: (float) treadDepth; - (float) treadDepth; @end // Tire

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Note that you don t declare the static function s prototype in a header file You simply write the function in the source file using the function

And here s the implementation of Tire, which is pretty straightforward:

C uses the printf statement for outputting to the standard output stream Its declaration is as follows:

#import "Tire.h" @implementation Tire - (id) init { if (self = [super init]) { pressure = 34.0; treadDepth = 20.0; } return (self); } // init

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int printf( const char *format, arg1, arg2, , argn);

The statement takes a pointer to the characters you wish to send to the standard output stream and zero or more items for formatting For instance, consider the following printf statement:

- (NSString *) description { NSString *desc; desc = [NSString stringWithFormat: @"Tire: Pressure: %.1f TreadDepth: %.1f", pressure, treadDepth];

printf("Hello world%d times", 22);

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The accessor methods provide a way for users of the tire to change the pressure and the tread depth. Let s take a quick look at the init method:

This statement results in the following output:

- (id) init { if (self = [super init]) { pressure = 34.0; treadDepth = 20.0; } return (self); } // init

Another common argument is %s for character strings For instance, the following code defines a character array and then prints it

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char * hello = "hello turkey"; printf("%s\n", hello);

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