public void TestComputeIBANFromBankAccount()
{
Debug.WriteLine("ComputeIBANFromBankAccount");
string prefix = "19";
string number = "2000145399";
string bank = "0800";
CzechBankAccount account = new CzechBankAccount(prefix, number, bank);
string expResult = "CZ6508000000192000145399";
string result = account.ToIBANFromCzechBankAccount();
Assert.AreEqual(expResult, result);
}
public void TestComputeIBANFromBankAccount2()
{
Debug.WriteLine("ComputeIBANFromBankAccount2");
string prefix = "178124";
string number = "4159";
string bank = "0710";
CzechBankAccount account = new CzechBankAccount(prefix, number, bank);
string expResult = "CZ6907101781240000004159";
string result = account.ToIBANFromCzechBankAccount();
Assert.AreEqual(expResult, result);
}
/// <summary>
/// Computes the IBAN number from a given Czech account information.
/// </summary>
/// <param name="account">A Czech account model class.</param>
/// <returns>An IBAN number.</returns>
public static string ToIBANFromCzechBankAccount(this CzechBankAccount account)
{
// preprocess the numbers
string prefix = string.Format("{0:000000}", long.Parse(account.Prefix));
string number = string.Format("{0:0000000000}", long.Parse(account.Number));
string bank = string.Format("{0:0000}", long.Parse(account.BankCode));
// calculate the check sum
string buf = bank + prefix + number + "123500";
int index = 0;
long pz = -1;
while (index <= buf.Length)
{
string dividend;
if (pz < 0)
{
dividend = buf.Substring(index, Math.Min(9, buf.Length - index));
index += 9;
}
else if (pz >= 0 && pz <= 9)
{
dividend = pz + buf.Substring(index, Math.Min(8, buf.Length - index));
index += 8;
}
else
{
dividend = pz + buf.Substring(index, Math.Min(7, buf.Length - index));
index += 7;
}
pz = long.Parse(dividend) % 97;
}
pz = 98 - pz;
// assign the checksum
string checksum = string.Format("{0:00}", pz);
// build the IBAN number
return("CZ" + checksum + bank + prefix + number);
}