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/*
Title: Currency Translation Machine
Author: Diego Zamudio
Description: Convert between currencies and save the result to a file.
*/
#include <iostream>
#include <fstream>
#include <iomanip>
#include <unordered_map>
#include <string>
#include <cctype>
#include <limits>
class CurrencyConverter {
public:
CurrencyConverter() {
// Approximate current mid-market rates (relative to 1 USD)
rates_ = {
{"USD", 1.00},
{"EUR", 0.86},
{"GBP", 0.75},
{"JPY", 158.6},
{"CAD", 1.34},
{"MXN", 17.65}
};
}
bool has(const std::string& code) const {
return rates_.count(toCode(code)) > 0;
}
double convert(double amount, const std::string& from, const std::string& to) const {
std::string f = toCode(from);
std::string t = toCode(to);
double inUsd = amount / rates_.at(f);
return inUsd * rates_.at(t);
}
static std::string toCode(std::string s) {
for (char& c : s) c = static_cast<char>(std::toupper(static_cast<unsigned char>(c)));
return s;
}
void listSupported(std::ostream& os) const {
os << "Supported codes: USD";
for (const auto& kv : rates_) {
if (kv.first != "USD") os << ", " << kv.first;
}
os << '\n';
}
private:
std::unordered_map<std::string, double> rates_;
};
struct IO {
static void intro(std::ostream& os) {
os << "Currency Translation Machine\n";
os << "Enter an amount and two currency codes. I will convert and save the result.\n\n";
}
static std::string promptCode(const std::string& msg, const CurrencyConverter& cc) {
while (true) {
std::cout << msg;
std::string code;
std::cin >> code;
if (cc.has(code)) return CurrencyConverter::toCode(code);
std::cout << "Unknown code. ";
cc.listSupported(std::cout);
}
}
static double promptAmount(const std::string& msg) {
while (true) {
std::cout << msg;
double x;
if (std::cin >> x && x >= 0.0) return x;
std::cout << "Enter a nonnegative number.\n";
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
}
}
};
int main() {
CurrencyConverter cc;
IO::intro(std::cout);
cc.listSupported(std::cout);
double amount = IO::promptAmount("Amount: ");
std::string from = IO::promptCode("From currency code: ", cc);
std::string to = IO::promptCode("To currency code: ", cc);
double result = cc.convert(amount, from, to);
std::cout << std::fixed << std::setprecision(2);
std::cout << "\nResult: " << amount << ' ' << from << " = " << result << ' ' << to << "\n";
std::ofstream out("currency_output.txt");
if (out) {
out << "Currency Translation Receipt\n";
out << "----------------------------\n";
out << std::fixed << std::setprecision(2);
out << "Amount: " << amount << ' ' << from << '\n';
out << "Converted: " << result << ' ' << to << '\n';
out << "From code: " << from << '\n';
out << "To code: " << to << '\n';
out << "Saved by: Currency Translation Machine\n";
std::cout << "Saved to currency_output.txt\n";
} else {
std::cerr << "Could not write currency_output.txt\n";
}
return 0;
}
Currency Translation Receipt
----------------------------
Amount: 10.00 USD
Converted: 176.50 MXN
From code: USD
To code: MXN
Saved by: Currency Translation Machine
Compiling Program...
Standard Input:
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Text
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