static void Main(string[] args)
{
Console.WriteLine("Enter 1 if you want number-to-roman, enter 2 if you want roman-to-number");
var line = Console.ReadLine();
Console.WriteLine();
if (line == "1")
{
var numbers = new int[] { 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 };
var romans = new string[] { "M", "CM", "D", "DC", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I" };
var length = romans.Length;
var stringResult = string.Empty;
Console.WriteLine("Enter a number:");
var number = Int32.Parse(Console.ReadLine());
for (int i = 0; i < length; i++)
{
while (numbers[i] <= number)
{
stringResult += romans[i];
number -= numbers[i];
}
}
Console.WriteLine("Result: {0}", stringResult);
}
else
{
var romans = new Roman[] { new Roman {
Char = 'M', Numeral = 1000
}, new Roman {
Char = 'D', Numeral = 500
}, new Roman {
Char = 'C', Numeral = 100
}, new Roman {
Char = 'L', Numeral = 50
}, new Roman {
Char = 'X', Numeral = 10
}, new Roman {
Char = 'V', Numeral = 5
}, new Roman {
Char = 'I', Numeral = 1
} };
int result = 0;
Console.WriteLine("Enter a roman:");
var roman = Console.ReadLine();
char[] romanCharArray = roman.ToCharArray();
var romanLength = romanCharArray.Length;
int index = 0;
while (index < romanLength)
{
if (romans[0].Char.Equals(romanCharArray[index]))
{
result += romans[0].Numeral;
index++;
continue;
}
if (romans[1].Char.Equals(romanCharArray[index]))
{
if (index + 1 < romanLength && romans[2].Char.Equals(romanCharArray[index + 1]))
{
result = romans[1].Numeral - romans[2].Numeral;
index += 2;
continue;
}
result += romans[1].Numeral;
index++;
continue;
}
if (romans[2].Char.Equals(romanCharArray[index]))
{
if (index + 1 < romanLength && romans[0].Char.Equals(romanCharArray[index + 1]))
{
result = romans[0].Numeral - romans[2].Numeral;
index += 2;
continue;
}
result += romans[2].Numeral;
index++;
continue;
}
if (romans[3].Char.Equals(romanCharArray[index]))
{
result += romans[3].Numeral;
index++;
continue;
}
if (romans[4].Char.Equals(romanCharArray[index]))
{
if (index + 1 < romanLength && romans[3].Char.Equals(romanCharArray[index + 1]))
{
result = romans[3].Numeral - romans[4].Numeral;
index += 2;
continue;
}
if (index + 1 < romanLength && romans[2].Char.Equals(romanCharArray[index + 1]))
{
result = romans[2].Numeral - romans[4].Numeral;
index += 2;
continue;
}
result += romans[4].Numeral;
index++;
continue;
}
if (romans[5].Char.Equals(romanCharArray[index]))
{
result += romans[5].Numeral;
index++;
continue;
}
if (romans[6].Char.Equals(romanCharArray[index]))
{
if (index + 1 < romanLength && romans[5].Char.Equals(romanCharArray[index + 1]))
{
result = romans[5].Numeral - romans[6].Numeral;
index += 2;
continue;
}
if (index + 1 < romanLength && romans[4].Char.Equals(romanCharArray[index + 1]))
{
result = romans[4].Numeral - romans[6].Numeral;
index += 2;
continue;
}
result += 1;
index++;
continue;
}
}
Console.WriteLine("Result: {0}", result);
}
}
