Why are the operator functlons declared as global (frlend) functlons and not as class member functlons? #ifndef ZIPPLUS4_H #define ZIPPLUS4_H #include using std::ostream; using std::istream; class zipPlus4 { // overloading output stream operator friend ostream & operator<<(ostream &, const ZipPlus4 &); // overloading input stream operator friend istream & operator>»(istream &, ZipPlus4 s); public : // Constructors zipplus4 ( ); Zipplus4 (int zip, int reg); // Destructor - Zipplus4 ( ); // Accessors int getzipCode () const; int getRegion () const; // Mutators void setzipCode (int zip); void setRegion (int reg); private: int zipcode; int region; // format is XxXXx-XXXX or ZIPCODE-REGION // XXXXX has 5 digits // XXXX has 4 digits }; #endif // ZIPPLUS4_H

Why are the operator functlons declared as global (frlend) functlons and not as class member functlons? #ifndef ZIPPLUS4_H #define ZIPPLUS4_H #include using std::ostream; using std::istream; class zipPlus4 { // overloading output stream operator friend ostream & operator<<(ostream &, const ZipPlus4 &); // overloading input stream operator friend istream & operator>»(istream &, ZipPlus4 s); public : // Constructors zipplus4 ( ); Zipplus4 (int zip, int reg); // Destructor - Zipplus4 ( ); // Accessors int getzipCode () const; int getRegion () const; // Mutators void setzipCode (int zip); void setRegion (int reg); private: int zipcode; int region; // format is XxXXx-XXXX or ZIPCODE-REGION // XXXXX has 5 digits // XXXX has 4 digits }; #endif // ZIPPLUS4_H

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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