//

 //  main.m

 //  L02HelloObjC

 //

 //  Created by JinXin on 15/11/25.

 //  Copyright © 2015年 JinXin. All rights reserved.

 //

 #import <UIKit/UIKit.h>

 #import "AppDelegate.h"

 // 类的声名部分

 @interface Hello : NSObject{

     int num;

 }

 -(void)sayHello;

 @end

 // 类的实现部分

 @implementation Hello

 -(instancetype)init{

     self = [super init]; // 初始化父类

     if (self) {

         num = ;

     }

     return self;

 }

 -(void)sayHello{

     NSLog(@"hello oc class");

     NSLog(@"num is %d",num);

 }

 @end

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

     Hello *h = [[Hello alloc]init];  // 创建类对象

     [h sayHello]; // 调用类方法

         @autoreleasepool {

         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

     }

 }