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C++ Cookbook
book

C++ Cookbook

by D. Ryan Stephens, Christopher Diggins, Jonathan Turkanis, Jeff Cogswell
November 2005
Beginner to intermediate content levelBeginner to intermediate
594 pages
16h 23m
English
O'Reilly Media, Inc.
Content preview from C++ Cookbook

13.4. Writing and Reading Currency

Problem

You need to write or read a formatted currency value to or from a stream.

Solution

Use the money_put and money_get facets to write and read currency, as shown in Example 13-6.

Example 13-6. Writing and reading currency

#include <iostream> #include <locale> #include <string> #include <sstream> using namespace std; long double readMoney(istream& in, bool intl = false) { long double val; // Create a reader facet const money_get<char>& moneyReader = use_facet<money_get<char> >(in.getloc()); // End marker istreambuf_iterator<char> end; // State variable for detecting errors ios_base::iostate state = 0; moneyReader.get(in, end, intl, in, state, val); // failbit will be set if something went wrong if (state != 0 && !(state & ios_base::eofbit)) throw "Couldn't read money!\n"; return(val); } void writeMoney(ostream& out, long double val, bool intl = false) { // Create a writer facet const money_put<char>& moneyWriter = use_facet<money_put<char> >(out.getloc()); // Write to the stream. Call failed() (the return value is an // ostreambuf_iterator) to see if anything went wrong. if (moneyWriter.put(out, intl, out, out.fill(), val).failed()) throw "Couldn't write money!\n"; } int main() { long double val = 0; float exchangeRate = 0.775434f; // Dollars to Euros locale locEn("english"); locale locFr("french"); cout << "Dollars: "; cin.imbue(locEn); val = readMoney(cin, false); cout.imbue(locFr); // Set the showbase flag so the currency char is printed ...
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Publisher Resources

ISBN: 0596007612Supplemental ContentErrata Page