From d8d8f1c987f118843d44ea27ac516f8fe866ded4 Mon Sep 17 00:00:00 2001
From: Oskar <open7software@gmail.com>
Date: Tue, 17 Sep 2024 15:02:56 +0200
Subject: more

---
 sales_data.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'sales_data.hpp')

diff --git a/sales_data.hpp b/sales_data.hpp
index cce4469..31929af 100644
--- a/sales_data.hpp
+++ b/sales_data.hpp
@@ -2,9 +2,15 @@
 #define SALES_DATA_H
 #include <string>
 struct SalesData {
+	std::string isbn() const { return BookNo; }
+	SalesData &combine(const SalesData);
+	double avg_price() const;
 	std::string BookNo;
 	unsigned int UnitsSold = 0;
 	double Revenue = 0.0;
 };
 
+SalesData add(const SalesData&, const SalesData&);
+std::ostream &print(std::ostream&, const SalesData&);
+std::istream &read(std::istream&, SalesData&);
 #endif
-- 
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