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ex14_13.h
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ex14_13.h
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//
// ex14_13.h
// Exercise 14.13
//
// Created by pezy on 3/9/15.
// Substraction and compound-substraction operations added by hoeselm on 4/10/16.
//
// @See ex7_41.h
// @Add overloaded input, output, addition, and compound-assignment operators
#ifndef CP5_CH14_EX14_13_H
#define CP5_CH14_EX14_13_H
#include <string>
#include <iostream>
class Sales_data {
friend std::istream& operator>>(std::istream&, Sales_data&); // input
friend std::ostream& operator<<(std::ostream&, const Sales_data&); // output
friend Sales_data operator+(const Sales_data&, const Sales_data&); // addition
friend Sales_data operator-(const Sales_data&, const Sales_data&); // substraction
public:
Sales_data(const std::string &s, unsigned n, double p):bookNo(s), units_sold(n), revenue(n*p){ }
Sales_data() : Sales_data("", 0, 0.0f){ }
Sales_data(const std::string &s) : Sales_data(s, 0, 0.0f){ }
Sales_data(std::istream &is);
Sales_data& operator+=(const Sales_data&); // compound-assignment
Sales_data& operator-=(const Sales_data&); // compound-substraction
std::string isbn() const { return bookNo; }
private:
inline double avg_price() const;
std::string bookNo;
unsigned units_sold = 0;
double revenue = 0.0;
};
std::istream& operator>>(std::istream&, Sales_data&);
std::ostream& operator<<(std::ostream&, const Sales_data&);
Sales_data operator+(const Sales_data&, const Sales_data&);
Sales_data operator-(const Sales_data&, const Sales_data&);
inline double Sales_data::avg_price() const
{
return units_sold ? revenue/units_sold : 0;
}
#endif // CP5_CH14_EX14_13_H