Objective-C Programming (Sixth Edition) Chapter 3 answers to exercises

1. invalid: 6_05 (cannot begin with a number)

A $ ($ is an invalid symbol ).

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];

Overlap.

5. Ease and reduce the memory (I understand that the question is not too clear ).

6. Understand the advantages and disadvantages of Procedural language and object-oriented language.

7.

// ------------ interface part -------------

#import <Foundation / Foundation.h>

@interface XYpoint: NSObject

-(void) setXcoordinate: (int) x;

-(void) setYcoordinate: (int) y;

-(int) xCoordinate;

-(int) yCoordinata;

@end


// ------------- implementation part -------------

#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 part ------------

#import <Foundation / Foundation.h>
// Remember to import the header file of the class
#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;
}


// The input result is as follows: 

16:34:18. 511 prog1 [3284: 303] newcoordinate is)

Program ended with exit code: 0

 

Objective-C Programming (Sixth Edition) Chapter 3 answers to exercises