Validate International Securities Identification Number: Difference between revisions

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 /* will print: T F F F T T T */</lang>
+=={{header|C++}}==
+<lang cpp>
+#include <string>
+#include <regex>
+#include <algorithm>
+#include <numeric>
+#include <sstream>
+bool CheckFormat(const std::string& isin)
+{
+	std::regex isinRegEpx(R"([A-Z]{2}[A-Z0-9]{9}[0-9])");
+	std::smatch match;
+	return std::regex_match(isin, match, isinRegEpx);
+}
+std::string CodeISIN(const std::string& isin)
+{
+	std::string coded;
+	int offset = 'A' - 10;
+	for (auto ch : isin)
+	{
+		if (ch >= 'A' && ch <= 'Z')
+		{
+			std::stringstream ss;
+			ss << static_cast<int>(ch) - offset;
+			coded += ss.str();
+		}
+		else
+		{
+			coded.push_back(ch);
+		}
+	}
+	return std::move(coded);
+}
+bool CkeckISIN(const std::string& isin)
+{
+	if (!CheckFormat(isin))
+		return false;
+	std::string coded = CodeISIN(isin);
+// from http://rosettacode.org/wiki/Luhn_test_of_credit_card_numbers#C.2B.2B11
+	return luhn(coded);
+}
+#include <iomanip>
+#include <iostream>
+int main()
+{
+	std::string isins[] = { "US0378331005", "US0373831005", "U50378331005",
+							"US03378331005", "AU0000XVGZA3", "AU0000VXGZA3",
+							"FR0000988040" };
+	for (const auto& isin : isins)
+	{
+		std::cout << isin << std::boolalpha << " - " << CkeckISIN(isin) <<std::endl;
+	}
+	return 0;
+}
+</lang>
 =={{header|Caché ObjectScript}}==