oc set/get方法

@interface People : NSObject
@property   int age;
@end

@implementation People

@end

int main(int argc, char * argv[]) {
    People *p=[[People alloc]init];
    p.age=10;//直接使用set方法
    NSLog(@"age %d\n",p.age);//直接使用get方法
    [p setAge:20];//调用set方法
    NSLog(@"age %d\n",[p age]);//调用get方法
    int test;
    test=1;
    
    NSLog(@"age %d\n",test);

    
}

@interface People : NSObject{
    int _age;
}
@property   int age;
@end

@implementation People
-(void)setAge:(int)age{
    NSLog(@"set age");
    _age=age;
}
-(int)age{
    NSLog(@"get age");
    return _age;
}
@end