the list of members changes from private to public Every time you insert the label in Software

Generating DataMatrix in Software the list of members changes from private to public Every time you insert the label
the list of members changes from private to public Every time you insert the label
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private:
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the list of members changes back to being private members You need not have just one public and one private group of members However, it is common to have just one public section and one private section
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Classes
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There is no universal agreement about whether the public members should be listed rst or the private members should be listed rst The majority seem to prefer listing the public members rst This allows for easy viewing of the portions programmers using the class actually get to use You can make your own decision on what you wish to place rst, but the examples in the book will go along with the majority and list the public members before the private members In one sense C++ seems to favor placing the private members rst If the rst group of members has neither the public: nor the private: speci er, then members of that group will automatically be private You will see this default behavior used in code and should be familiar with it However, we will not use it in this book
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s ACCESSOR AND MUTATOR FUNCTIONS
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You should always make all member variables in a class private You may sometimes need to do something with the data in a class object, however The member functions will allow you to do many things with the data in an object, but sooner or later you will want or need to do something with the data for which there is no member function How can you do anything new with the data in an object The answer is that you can do anything you might reasonably want, provided you equip your classes with suitable accessor and mutator functions These are member functions that allow you to access and change the data in an object in a very general way Accessor functions allow you to read the data In Display 64, the member functions getMonthNumber and getDay are accessor functions The accessor functions need not literally return the values of each member variable, but they must return something equivalent to those values For example, for a class like DayOfYear, you might have an accessor function return the name of the month as some sort of string value, rather than return the month as a number Mutator functions allow you to change the data In Display 64, the two functions named set are mutator functions It is traditional to use names that include the word get for accessor functions and names that include the word set for mutator functions (The functions input and output in Display 64 are really mutator and accessor functions, respectively, but I/O is such a special case that they are usually just called I/O functions rather than accessor or mutator functions) Your class de nitions should always provide an adequate collection of accessor and mutator functions It may seem that accessor and mutator functions defeat the purpose of making member variables private, but that is not so Notice the mutator function set in Display 64 It will not allow you to set the month member variable to 13 or to any number that does not represent a month Similarly, it will not allow you to set the day member variable to any number that is not in the range 1 to 31 (inclusive) If the variables were public you could set the data to values that do not make sense for a date (As it is, you can still set the data to values that do not represent a real date, such as February 31, but it would be easy to exclude these dates as well We did not exclude these dates to keep the example simple) With mutator functions, you can control and lter changes to the data
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