OC 函数和对象方法的区别

#import <Foundation/Foundation.h>

@interface Person:NSObject{
@public
NSString *name;
int _age;
float _weight;
}

-(void)walk:(int)num;
@end

@implementation Person

//每走一百步，体重减少0.2
-(void)walk:(int)num{
_weight-=100/num * 0.2f;
NSLog(@"%@ has walk %d, your weight is %f",name, num, _weight);
}
//添加函数
void add(int x, int y){
NSLog(@"sum = %d", x + y);
}

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

@autoreleasepool {

//
Person *person = [Person new];
person->name = @"tom";
person->_age = 22;
person->_weight = 120.0f;

[person walk:50];

//调用函数
add(5,8);

}
return 0;
}