// 08-receipt.cpp : output a till-receipt from user input

import std;

using namespace std;

struct Entry {

string product;

size_t quantity;

double unit_price;

inline static double total{};

};

Entry add_entry(const string& input) {

Entry e;

istringstream iss{ input };

iss >> e.product >> e.quantity >> e.unit_price;

if (iss.fail()) {

cerr << "Bad entry.\n";

e.quantity = 0;

}

else {

Entry::total += e.quantity * e.unit_price;

}

return e;

}

int main() {

vector<Entry> sales;

cout << "Please enter: PRODUCT QTY PRICE (eg. \'Apple 6 0.50\')\n";

string s;

getline(cin, s);

while(!s.empty()) {

sales.emplace_back(add_entry(s));

cout << "Please enter: PRODUCT QTY PRICE (blank line to finish)\n";

getline(cin, s);

}

cout << "====================\n";

auto f = cout.flags();

auto p = cout.precision(2);

cout.setf(ios_base::fixed, ios_base::floatfield);

for (const auto& line : sales) {

if (line.quantity) {

cout.setf(ios_base::left, ios_base::adjustfield);

cout.width(11);

cout << line.product;

cout.unsetf(ios_base::adjustfield);

cout.width(3);

cout << line.quantity;

cout.width(6);

cout << line.unit_price << '\n';

}

}

cout << "====================\n";

cout << "Total:";

cout.width(14);

cout << Entry::total << '\n';

cout.flags(f);

cout.precision(p);

}