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。

////  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;}