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There should be no surprises here. The superclass (NSObject, in this case) is told to initialize itself, and the return value from that call is assigned to self. Then, the instance variables are assigned to useful default values. Let s make a brand new tire like this:

Java does away with pointers; however, Objective-C relies extensively upon pointers A pointer is a reference to another variable, or more technically, a pointer is a variable that references another variable s memory space Think of your computer s memory as one large cubbyhole block A variable occupies a cubbyhole A pointer points to the particular cubbyhole, but the pointer s value is not the value in the cubbyhole; the pointer s value is the cubbyhole s address In Figure 2-3, the cubbyhole n is located in row 2, column 5, and its value is 12 Cubbyhole n s value is 12, and its address is second row, fifth column Pointer p points to n s location, which is second row, fifth column Pointer p s value is not 12, but rather, second row, fifth column This is an important distinction

Firm A $10,000,000

Tire *tire = [[Tire alloc] init];

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2:

The tire s pressure will be 34 psi, and its tread depth will be 20 mm. We should change the description method, too:

Figure 2-3

(8,500,000)

You indicate pointers using the asterisk (*) Pointers point to a location in memory of another variable The ampersand (&) indicates a variable s address in memory

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

1 Create a new C command-line application, and name the application Using Pointers 2 Modify mainc file so that it appears like Listing 2-13 3 Select the project in the pull-down and click the Run button

The description method now uses NSString s stringWithFormat: class method to make a string that includes the tire pressure and tread depth. Does this method follow our rules of good memory management behavior Yes, it does. Because the object was not created by an alloc, copy, or new, it has a retain count of 1 and we can consider it to be autoreleased. So, this string will get cleaned up when the autorelease pool is destroyed.

@ 85%

Listing 2-13

#include <stdioh> int main (int argc, const char * argv[]) { int anIntVal = 10; int *pavalue = & anIntVal; printf("address:%p value:%d\n", pavalue, *pavalue); return 0; }

Updating main()

1,500,000

In this listing, anIntVal s value is 10, pavalue points to anIntVal s memory address, and the printf statement prints anIntVal s address followed by anIntVal s value; pavalue points to anIntVal s address while *pavalue is anIntVal s value

Here is the main.m file, which is a hair more complicated than it was before:

If you are following along in Xcode, realize your address values will be different from those listed in this chapter s example code results address:0xbffff628 value:10 4 Modify main so that the first two lines appear as follows: //int avalue = 10; int avalue;

#import #import #import #import "Engine.h" "Car.h" "Slant6.h" "AllWeatherRadial.h"

(continued)

1,500,000

5 Add the following line to just before the function s return statement: printf("value's actual value:%d\n", avalue); 6 Compile and run Listing 2-14 contains the incorrect output

int main (int argc, const char * argv[]) { NSAutoreleasePool *pool; pool = [[NSAutoreleasePool alloc] init]; Car *car = [[Car alloc] init]; int i; for (i = 0; i < 4; i++) { Tire *tire; tire = [[Tire alloc] init]; [tire setPressure: 23 + i]; [tire setTreadDepth: 33 - i]; [car setTire: tire atIndex: i]; [tire release]; } Engine *engine = [[Slant6 alloc] init]; [car setEngine: engine]; [car print]; [car release]; [pool release]; return (0); } // main

Listing 2-14

150%

Let s pull main() apart, piece by piece. We start by making an autorelease pool for autoreleased objects to swim around in while they await the pool s destruction:

address:0xbffff764 value:0 value's actual value:0 Program exited with status value:0

NSAutoreleasePool *pool; pool = [[NSAutoreleasePool alloc] init];

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