Roman/Arabic Numeral Converter
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using System;
class MainClass {
static int arabic(string rom)//converts roman numerals to arabic
{
int res = 0;
for(int i =0; i < rom.Length; i++)
{
{
if(rom[i].Equals('i')||rom[i].Equals('I'))
{
if(i == rom.Length-1)
++res;
else if(rom[i+1].Equals('i')||rom[i+1].Equals('I'))
++res;
else
--res;
}
if(rom[i].Equals('v')||rom[i].Equals('V'))
{
if(i == rom.Length-1)
res+=5;
else if(rom[i+1].Equals('i')||rom[i+1].Equals('I')||rom[i+1].Equals('v')||rom[i+1].Equals('V'))
res+=5;
else
res-=5;
}
if(rom[i].Equals('x')||rom[i].Equals('X'))
{
if(i == rom.Length-1)
res+=10;
else if(rom[i+1].Equals('i')||rom[i+1].Equals('I')||rom[i+1].Equals('v')||rom[i+1].Equals('V')||rom[i+1].Equals('x')||rom[i+1].Equals('X'))
res+=10;
else
res-=10;
}
if(rom[i].Equals('l')||rom[i].Equals('L'))
{
if(i == rom.Length-1)
res+=50;
else if(rom[i+1].Equals('i')||rom[i+1].Equals('I')||rom[i+1].Equals('v')||rom[i+1].Equals('V')||rom[i+1].Equals('x')||rom[i+1].Equals('X')||rom[i+1].Equals('l')||rom[i+1].Equals('L'))
res+=50;
else
res-=50;
}
if(rom[i].Equals('c')||rom[i].Equals('C'))
{
if(i == rom.Length-1)
res+=100;
else if(rom[i+1].Equals('i')||rom[i+1].Equals('I')||rom[i+1].Equals('v')||rom[i+1].Equals('V')||rom[i+1].Equals('x')||rom[i+1].Equals('X')||rom[i+1].Equals('l')||rom[i+1].Equals('L')||rom[i+1].Equals('c')||rom[i+1].Equals('C'))
res+=100;
else
res-=100;
}
if(rom[i].Equals('d')||rom[i].Equals('D'))
{
if(i == rom.Length-1)
res+=500;
else if(rom[i+1].Equals('i')||rom[i+1].Equals('I')||rom[i+1].Equals('v')||rom[i+1].Equals('V')||rom[i+1].Equals('x')||rom[i+1].Equals('X')||rom[i+1].Equals('l')||rom[i+1].Equals('L')||rom[i+1].Equals('c')||rom[i+1].Equals('C')||rom[i+1].Equals('d')||rom[i+1].Equals('D'))
res+=500;
else
res-=500;
}
if(rom[i].Equals('m')||rom[i].Equals('M'))
{
if(i == rom.Length-1)
res+=1000;
else if(rom[i+1].Equals('i')||rom[i+1].Equals('I')||rom[i+1].Equals('v')||rom[i+1].Equals('V')||rom[i+1].Equals('x')||rom[i+1].Equals('X')||rom[i+1].Equals('l')||rom[i+1].Equals('L')||rom[i+1].Equals('c')||rom[i+1].Equals('C')||rom[i+1].Equals('d')||rom[i+1].Equals('D')||rom[i+1].Equals('m')||rom[i+1].Equals('M'))
res+=1000;
else
res-=1000;
}
}
}
return res;
}
static string roman(int arab)//converts arabic numerals to roman
{
string rom = "";
while(arab!=0)
{
if(arab-1000>=0)
{
rom = rom.Insert(rom.Length,"M");
arab-=1000;
}
else if(Math.Abs(arab-900)<=100&&arab>799)
{
rom = rom.Insert(rom.Length,"CM");
arab-=900;
}
else if(arab-500>=0)
{
rom = rom.Insert(rom.Length,"D");
arab-=500;
}
else if(Math.Abs(arab-400)<=100&&arab>299)
{
rom = rom.Insert(rom.Length,"CD");
arab-=400;
}
else if(arab-100>=0)
{
rom = rom.Insert(rom.Length,"C");
arab-=100;
}
else if(Math.Abs(arab-90)<=10&&arab>79)
{
rom = rom.Insert(rom.Length,"XC");
arab-=90;
}
else if(arab-50>=0)
{
rom = rom.Insert(rom.Length,"L");
arab-=50;
}
else if(Math.Abs(arab-40)<=10&&arab>39)
{
rom = rom.Insert(rom.Length,"XL");
arab-=40;
}
else if(arab-10>=0)
{
rom = rom.Insert(rom.Length,"X");
arab-=10;
}
else if(Math.Abs(arab-9)<=1&&arab!=8)
{
rom = rom.Insert(rom.Length,"IX");
arab-=9;
}
else if(arab-5>=0)
{
rom = rom.Insert(rom.Length,"V");
arab-=5;
}
else if(Math.Abs(arab-4)<=1&&arab!=3)
{
rom = rom.Insert(rom.Length,"IV");
arab-=4;
}
else if(arab-1>=0)
{
rom = rom.Insert(rom.Length,"I");
arab-=1;
}
//arab = 0;
}
return rom;
}
static void Main()
{
bool y = true;
Console.Write("input: ");
string s = Console.ReadLine();
Console.Write(s + "\noutput: ");
for(int i = 0; i < 10; i++)
{
if(s.IndexOf(Convert.ToString(i)) != -1)//if ints are detected in the string it is put through the roman converter
{
Console.WriteLine(roman(Convert.ToInt32(s)));
y = false;
break;
}
}
if (y == true)//if no ints are detected in the string it is put through the arabic converter
{
Console.Write(arabic(s));
}
}
}
Csharp
INFO