1 files changed, 30 insertions, 3 deletions
diff --git a/sales_data.hpp b/sales_data.hpp
index 7cb3022..0820cd5 100644
--- a/sales_data.hpp
+++ b/sales_data.hpp
@@ -1,7 +1,16 @@
 #ifndef SALES_DATA_H
 #define SALES_DATA_H
 #include <string>
+struct SalesData;
+SalesData add(const SalesData&, const SalesData&);
+std::ostream &print(std::ostream&, const SalesData&);
+std::istream &read(std::istream&, SalesData&);
 struct SalesData {
+	SalesData() = default;
+	SalesData(const std::string &s): BookNo(s) { }
+	SalesData(const std::string &s, unsigned n, double p):
+		BookNo(s), UnitsSold(n), Revenue(p*n) { }
+	SalesData(std::istream &sdcin) { read(sdcin, *this); };
 	std::string isbn() const { return BookNo; }
 	SalesData &combine(const SalesData&);
 	double avg_price() const;
@@ -25,8 +34,26 @@ SalesData& SalesData::combine(const SalesData &rhs) {
 	return *this;
 }
 
-SalesData add(const SalesData&, const SalesData&);
-std::ostream &print(std::ostream&, const SalesData&);
-std::istream &read(std::istream&, SalesData&);
+std::istream &read(std::istream &is, SalesData &item) {
+
+	double price = 0;
+	is >> item.BookNo >> item.UnitsSold >> price;
+	item.Revenue = price * item.UnitsSold;
+	return is;
+}
+
+std::ostream &print(std::ostream &os, const SalesData &item) {
+	
+	os << item.isbn() << " " << item.UnitsSold << " "
+	   << item.Revenue << " " << item.avg_price();
+	return os;
+}
+
+SalesData add(const SalesData sd1, const SalesData sd2) {
+
+	SalesData sdsum = sd1;
+	sdsum.combine(sd2);
+	return sdsum;
+}
 
 #endif