#import<Foundation/Foundation.h>
@interface Person: NSObject
{
    @public
    int _age;
    float _weight;

}
-(float) eat:(int)x;
-(float) walk:(int)x;
@end
@implementation Person
-(float) eat:(int)x{
    _weight+=0.6*x;
    return _weight;
}
-(float) walk:(int)x{
    _weight-=0.2*(x/100);
    return _weight;
}
@end

int main(){

    @autoreleasepool {
        Person *person=[Person new];
        person->_weight=100;
        
        float eatWeight=[person eat:1];
        float walkWeight=[person walk:200];
        
        NSLog(@"eatWeight=%.2f,walkWeight=%.2f",eatWeight,walkWeight);
    }
   return 0;
}

#import<Foundation/Foundation.h>
@interface Person: NSObject
{
    @public
    int _age;
    float _weight;

}
-(float) eat:(int)x;
-(float) walk:(int)x;
@end
@implementation Person
-(float) eat:(int)x{
    _weight+=0.6*x;
    return _weight;
}
-(float) walk:(int)x{
    _weight-=0.2*(x/100);
    return _weight;
}
@end

int main(){

    @autoreleasepool {
        Person *person=[Person new];
        person->_weight=100;
        
        float eatWeight=[person eat:1];
        float walkWeight=[person walk:200];
        
        NSLog(@"eatWeight=%.2f,walkWeight=%.2f",eatWeight,walkWeight);
    }
   return 0;
}