//

 //  main.m

 //  03-动态绑定

 //

 //  Created by mac on 15/8/11.

 //  Copyright (c) 2015年. All rights reserved.

 //

 #import <Foundation/Foundation.h>

 #import "Fraction.h"

 #import "Complex.h"

 #import "MyException.h"

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

 {

     @autoreleasepool

     {

         //测试分数类

         Fraction *f1 = [[Fraction alloc]initWithNumerator:

                                            addDenominator:];

         [f1 print];

         Fraction *f2 = [[Fraction alloc]initWithNumerator:

                                            addDenominator:];

         [f2 print];

         Fraction *f3 = [f1 add:f2];

         [f3 print];

         //测试复数类

         Complex *c1 = [[Complex alloc]initWithReal:5.0 andImag:3.0];

         [c1 print];

         Complex *c2 = [[Complex alloc]initWithReal:4.3 andImag:2.5];

         [c2 print];

         Complex *c3 = [c1 add: c2];

         [c3 print];

         //测试动态绑定

         id pObj = nil;

         pObj = f3;

         [f3 print];

         pObj = c3;

         [c3 print];

         MyException *pe;

         @try//将容易出现异常的代码放在try代码块里面

         {

           id arr[] = {c1,f1,@""};

           for(int i=;i<;i++)

           {

               [arr[i] print];

               pe = [[MyException alloc] initWithName:@"MyException" reason:@"test" userInfo:nil];

               @throw pe;//主动抛出自定义的异常

           }

             NSLog(@"try last statement");//在出现异常后会跳过@try中后续的代码,不会执行。

         }

         @catch(MyException *e)//捕捉自定义的异常

         {

             NSLog(@"MyException:%@",[e reason]);

         }

         @catch(NSException *e)//系统捕捉异常

         {

             NSLog(@"%@",[e reason]);

         }

         @finally//最终处理

         {

             NSLog(@"finally");

         }

         //异常处理完,后续代码会继续执行

         NSLog(@"last statement!");

     }

     return ;

 }