Constant Member FunctionsC++ Specific Declaring a member function with the const keyword specifies that the function is a "read-only" function that does not modify the object for which it is called.To declare a constant member function, place the const keyword after the closing parenthesis of the argument list. The const keyword is required in both the declaration and the definition. A constant member function cannot modify any data members or call any member functions that aren't constant.END C++ SpecificExample// Example of a constant member functionclass Date{public:   Date( int mn, int dy, int yr );   int getMonth() const;       // A read-only function   void setMonth( int mn );    // A write function;                               //    cannot be constprivate:   int month;};int Date::getMonth() const{   return month;        // Doesn't modify anything}void Date::setMonth( int mn ){   month = mn;          // Modifies data member}