text: //
  //  DateCalculator.h
  //  Lab2
  //
  //  Created by Naoki Mita on 2020-03-24.
  //  Copyright © 2020 Naoki Mita. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  NS_ASSUME_NONNULL_BEGIN
  
  @interface DateCalculator : NSObject
  + (void) sayHelloWith: (NSString *) message andName: (NSString *) name;
  - (void) setMyAge: (float) myAge;
  - (float) myAge;
  
  @end
  
  NS_ASSUME_NONNULL_END
  