Objective-C 程式設計（第六版）第三章習題答案

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1.   不合法：6_05 (不能以數字開頭)

                 A$ ($是非法符號).

2.   myBook  (openBook,closeBook,readBook,takeBook,putBook).

3.   [myBook takeBook];

      [myBook openBook];

      [myBook readBook];

      [myBook closeBook];

      [myBook putBook];

4.   [myBoat driver];

      [myMotorcycle driver];

      [myCar driver];

      重疊.

5.   方便，減小記憶體（我理解的是這樣，題目不是太明白）.

6.   瞭解過程性語言和物件導向語言的優缺點就OK拉.

7.   

//------------interface部分-------------#import <Foundation/Foundation.h>@interface XYpoint : NSObject- (void) setXcoordinate: (int) x;- (void) setYcoordinate: (int) y;- (int) xCoordinate;- (int) yCoordinata;@end//-------------implementation部分-------------#import "XYpoint.h"@implementation XYpoint{    int xCoordinate;    int yCoordinate;}- (void) setXcoordinate: (int) x{    xCoordinate = x;}- (void) setYcoordinate: (int) y{    yCoordinate = y;}- (int) xCoordinate{    return xCoordinate;}- (int) yCoordinata{    return yCoordinate;}@end//-------------program部分------------#import <Foundation/Foundation.h>//切記要匯入類的標頭檔#import "XYpoint.h"int main(int argc, const char * argv[]){    @autoreleasepool {                // insert code here...        XYpoint *newCoordinate = [[XYpoint alloc]init];                [newCoordinate setXcoordinate:12];        [newCoordinate setYcoordinate:15];                NSLog(@"newCoordinate is (%d,%d)",[newCoordinate xCoordinate], [newCoordinate yCoordinata]);                    }    return 0;}


//輸入結果如下：

          2014-09-14 16:34:18.511 prog1[3284:303] newCoordinate is (12,15)

          Program ended with exit code: 0

 

Objective-C 程式設計（第六版）第三章習題答案