obj c car 未拆分(此程序不符合内存管理规则)

xcode4.2，未拆分程序，都在一个文件内

////  main.m//  carDemo////  Created by Wunderman on 12-1-3.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import <Foundation/Foundation.h>@interface Tire : NSObject {    int index;}- (int) index;- (void) setIndex : (int) i;@end@implementation Tire- (int) index {    return index;  };- (void) setIndex : (int) i {    index = i;}- (NSString *) description {    //return (@"I am a tire. i'am in %d", index);    NSString* sFormat = [[NSString alloc] initWithFormat: @"I am a tire. i'am in %d", index];    NSString* string = [[NSString alloc] initWithString: sFormat];    return string;}@end //Tire impl@interface Engine : NSObject @end@implementation Engine- (NSString *) description {    return (@"I am a engine. Vrooom");}@end //Engine impl@interface Car : NSObject {    Engine *engine;    Tire *tires[4];}//engine's get set- (Engine *) engine;- (void) setEngine : (Engine *) newEngine;//tire's get set- (Tire *)tireAtIndex: (int) index;- (void) setTire: (Tire *) tire         atIndex: (int) index;- (void) print;@end //  Car inter@implementation Car/*- (id)init {    self = [super init];    if (self) {        engine = [[Engine alloc] init];        tires[0] = [[Tire alloc] init];        tires[1] = [[Tire alloc] init];        tires[2] = [[Tire alloc] init];        tires[3] = [[Tire alloc] init];    }    return self;}*/- (Engine *) engine {    return engine;}- (void) setEngine:(Engine *) newEngine {    engine = newEngine;}- (Tire *)tireAtIndex: (int) index {    if (index >3 || index < 0) {        NSLog(@"bad index %d", index);        exit(1);    }    return tires[index];}- (void) setTire: (Tire *) tire         atIndex: (int) index {    if (index >3 || index < 0) {        NSLog(@"bad index %d", index);        exit(1);    }    tires[index] = tire;}// car impl- (void) print {    NSLog(@"%@", engine);    NSLog(@"%@", tires[0]);    NSLog(@"%@", tires[1]);    NSLog(@"%@", tires[2]);    NSLog(@"%@", tires[3]);}@end// Carint main (int argc, const char * argv[]){    @autoreleasepool {                // insert code here...        NSLog(@"Hello, World!");        Car *car = [[Car alloc] init];                Engine *engine = [[Engine alloc] init];        [car setEngine: engine];        int i;        for (i=0; i<4; i++) {            Tire *tire = [[Tire alloc] init];            [tire setIndex: i];            [car setTire:tire                 atIndex:i];        }        [car print];    }    return 0;}

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