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ex3_01b.cpp
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ex3_01b.cpp
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#include <iostream>
#include <string>
#include "../ch02/Sales_data.h"
using std::cin;
using std::cout;
using std::endl;
using std::cerr;
int main()
{
Sales_data data1, data2;
// code to read into data1 and data2
double price = 0; // price per book, used to calculate total revenue
// read the first transactions: ISBN, number of books sold, price per book
cin >> data1.bookNo >> data1.units_sold >> price;
// calculate total revenue from price and units_sold
data1.revenue = data1.units_sold * price;
// read the second transaction
cin >> data2.bookNo >> data2.units_sold >> price;
data2.revenue = data2.units_sold * price;
// code to check whether data1 and data2 have the same ISBN
// and if so print the sum of data1 and data2
if (data1.bookNo == data2.bookNo) {
unsigned totalCnt = data1.units_sold + data2.units_sold;
double totalRevenue = data1.revenue + data2.revenue;
// print: ISBN, total sold, total revenue, average price per book
cout << data1.bookNo << " " << totalCnt << " " << totalRevenue << " ";
if (totalCnt != 0)
cout << totalRevenue / totalCnt << endl;
else
cout << "(no sales)" << endl;
return 0; // indicate success
}
else { // transactions weren't for the same ISBN
cerr << "Data must refer to the same ISBN" << endl;
return -1; // indicate failure
}
}