NSException与NSError在使用中有哪些区别？

#import <Foundation/Foundation.h>

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

    @autoreleasepool {
        NSException* ex = [[NSException alloc]initWithName:@"MyException"  
                                                    reason:@"b==0"   
                                                  userInfo:nil];  

        @try   
        {  
            int b = 0;   
            switch (b)    
            {  
                case 0:  
                    @throw(ex);//b=0，则抛出异常；  
                    break;  
                default:  
                    break;  
            }  
        }  
        @catch (NSException *exception)//捕获抛出的异常   
        {  
            NSLog(@"exception.name= %@" ,exception.name);
            NSLog(@"exception.reason= %@" ,exception.reason);
            NSLog(@"b==0 Exception!");  
        }  
        @finally   
        {  
            NSLog(@"finally!");  
        }  
        [ex release];  

    }
    return 0;
}

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