static void Main(string[] args)
{
NumberConverter nc = new NumberConverter();
string result = nc.FromNumberToWords((long)1e18 + 30 );
Console.WriteLine(result);
}
public void FromNumberToWords_11to19()
{
string[] str = new string[] { "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "ninteen" };
NumberConverter nc = new NumberConverter();
int si = 11;
int count = 9;
foreach (var i in Enumerable.Range(si, count))
{
var result = nc.FromNumberToWords(i);
Assert.AreEqual(str[i - si], result);
}
}
public void FromNumberToWords_0to10()
{
string[] str = new string[] { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten" };
NumberConverter nc = new NumberConverter();
foreach (var i in Enumerable.Range(0, 11))
{
var result = nc.FromNumberToWords(i);
Assert.AreEqual(str[i], result);
}
}
public void FromNumberToWords_20To99()
{
string[] str = new string[] { "", " one", " two", " three", " four", " five", " six", " seven", " eight", " nine" };
NumberConverter nc = new NumberConverter();
var range = Enumerable.Range(20, 8);
foreach (var i in range)
{
string exp = "";
string result = "";
if (i >= 20 && i <= 29)
exp = "twenty" + str[i - 20];
if (i >= 30 && i <= 39)
exp = "thirty" + str[i - 30];
if (i >= 40 && i <= 49)
exp = "fourty" + str[i - 40];
if (i >= 50 && i <= 59)
exp = "fifty" + str[i - 50];
if (i >= 60 && i <= 69)
exp = "sixty" + str[i - 60];
if (i >= 70 && i <= 79)
exp = "seventy" + str[i - 70];
if (i >= 80 && i <= 89)
exp = "eighty" + str[i - 80];
if (i >= 90 && i <= 99)
exp = "ninty" + str[i - 90];
result = nc.FromNumberToWords(i);
Assert.AreEqual(exp, result);
}
}
public void FromNumberToWords_Random100To999()
{
NumberConverter nc = new NumberConverter();
string result = nc.FromNumberToWords(100);
var exp = "one hundred,hundred".Split(new string[] { "," }, StringSplitOptions.None);
Assert.IsTrue(exp.Any(d => d == result));
result = nc.FromNumberToWords(101);
Assert.AreEqual("one hundred one", result);
result = nc.FromNumberToWords(110);
Assert.AreEqual("one hundred ten", result);
result = nc.FromNumberToWords(113);
Assert.AreEqual("one hundred thirteen", result);
result = nc.FromNumberToWords(199);
Assert.AreEqual("one hundred ninty nine", result);
result = nc.FromNumberToWords(250);
Assert.AreEqual("two hundred fifty", result);
result = nc.FromNumberToWords(999);
Assert.AreEqual("nine hundred ninty nine", result);
result = nc.FromNumberToWords(405);
Assert.AreEqual("four hundred five", result);
}
public void FromNumberToWords_Random1KTo1M()
{
NumberConverter nc = new NumberConverter();
string result = nc.FromNumberToWords(10001);
Assert.AreEqual("ten thousand one", result);
result = nc.FromNumberToWords(123456);
Assert.AreEqual("one hundred twenty three thousand four hundred fifty six", result);
result = nc.FromNumberToWords(900000);
Assert.AreEqual("nine hundred thousand", result);
}