oc面向對象編程——（類·方法·對象）

//---------------類-----------------------

#import <Foundation/Foundation.h>

@interface Rectangle : NSObject

{

    int length;

    int height;

}

@property(nonatomic) int length;

@property(nonatomic) int height;

-(int)setLength;

-(int)setHeight;

-(int) perimeter;

-(int) area;

@end

//

//  Rectangle.m

//  Rectangle

//

//  Created by 3-7 on 13-4-17.

//  Copyright (c) 2013年 ＊＊. All rights reserved.

//-----------方法------------

#import "Rectangle.h"

@implementation Rectangle

@synthesize length;

@synthesize height;

-(void) setLength:(int)l

{

    length=l;

}

-(void) setHeight:(int)h

{

    height=h;

}

-(int) perimeter

{

    return (length+height)*2;

}

-(int) area

{

    return length*height;

    

}

@end

//

//  main.m

//  Rectangle

//

//  Created by 3-7 on 13-4-17.

//  Copyright (c) 2013年 ＊＊. All rights reserved.

//＊＊＊＊＊＊＊＊＊＊＊對象＊＊＊＊＊＊＊＊＊＊＊

#import <Foundation/Foundation.h>

#import "Rectangle.h"

int main(int argc, const char * argv[])

{

    @autoreleasepool {

        

        // insert code here...

        NSLog(@"Hello, World!");

        Rectangle *rectangle=[[Rectangle alloc]init];

        

        

        [rectangle setLength:20];

        [rectangle setHeight:20];

        NSLog(@"perimeter:%d",rectangle.perimeter);

        NSLog(@"area:%d",rectangle.area);

                

        

    }

    return 0;

}