Object-c 学习之路一（Hello world）

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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;}