OC 使用#pragma mark代码分组

#import <Foundation/Foundation.h>
#pragma mark Person类
interface Person:NSObject{
@public
NSString *name;
int _age;
float _weight;
}

-(void)walk:(int)num;
@end
#pragma mark -
#pragma mark Person实现
@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);
}
#pragma mark -
#pragma mark 主函数
@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];

}
return 0;
}