Object-c 学习之路一（Hello world）

本人从今天开始学习oc 了心里灰常高兴，写了个hello world 留作纪念。

 

#import <Foundation/Foundation.h>



@interface Rectangle : NSObject

{



    int width;

    int height;





}

-(void) setWidth:(int) w setGeight:(int) h;

-(int) gePerimeter;

-(int) getArea;



@end

 

#import "Rectangle.h"



@implementation Rectangle



-(void) setWidth:(int) w setGeight:(int) h{



    width=w;

    height=h;

}

-(int) gePerimeter{

    return (width+height)*2;

}

-(int) getArea{

    return width*height;

}



@end

Square 类继承Rectangle类

 

 

#import "Rectangle.h"



@interface Square : Rectangle



-(void) setSide:(int) w;

-(int) side;



@end

 

 

 

#import "Square.h"



@implementation Square:Rectangle

-(void) setSide:(int)w

{

    [self setWidth:w setGeight:w];



}

-(int) side{

    return width;

}

-(int) getArea{

    return [self side]*[self side];

}







@end

主文件：

 

 

//

//  main.m

//  OcStart

//

//  Created by WildCat on 13-3-25.

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

//



#import <Foundation/Foundation.h>

#import "Person.h"

#import "Rectangle.h"

#import "Square.h"



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

{



    @autoreleasepool {

        

        // insert code here...

        NSLog(@"Hello, World!");

        NSLog(@"李兴乐你好！！");

    

        

        //定义一个Person类

        Person * p=[[Person alloc] init];

        [p setStr:@"李兴乐"];

        [p myPrint];

        //定义一个Rectangle类对象

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

        

        [r setWidth:3 setGeight:4];

        int area=[r getArea];

        int perimeter=[r gePerimeter];

        NSLog(@"The Area is:%d ,the parimeter is %d",area,perimeter);

        //定义一个Square实例对象

        Square *s=[[Square alloc] init];

        //键盘输入正方型的边长

        NSLog(@"请输入正方形的边长");

        int number;

        scanf("%i",&number);

        //设置边长

        [s setSide:number];

        int side=[s side];

        int areas=[s getArea];

        int perimeters=[s gePerimeter];

        NSLog(@"The square's side is :%d ,the area is : %d ,the primeter is : %d",side,areas,perimeters);

        

        NSString *hello=@"sdfgdsf";

        //转换为大写

        hello=[hello uppercaseString];

        NSLog(hello);

        //调用字符串的求长度方法

        NSLog(@"The String length is : %ld",[hello length]);

      

        

        

    }

    return 0;

}