public DivideCommand(IMathMaker mathMaker) { _mathMaker = mathMaker; }
public MultiplyCommand(IMathMaker mathMaker) { _mathMaker = mathMaker; }
public SubstractCommand(IMathMaker mathMaker) { _mathMaker = mathMaker; }
public AddCommand(IMathMaker mathMaker) { _mathMaker = mathMaker; }