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264 changes: 260 additions & 4 deletions src/RomanNumerals.java
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Original file line number Diff line number Diff line change
@@ -1,8 +1,264 @@
import static org.junit.Assert.fail;

public class RomanNumerals {
public int convertToInteger(String romanNum) {
// To be Implemented
return 0;
import java.util.Scanner;

public class RomanNumerals
{
public static void main(String [] args)
{
String inputs = null;
int arabic = 0;

System.out.println("Roman numeral converter program.\n");

Scanner reader = new Scanner(System.in);
System.out.println("Input the numeral: ");
inputs = reader.nextLine();
reader.close();

//now we have the roman numeral string as inputs

//let's scan it through and see that it is valid
for(int i = 0; i < inputs.length(); i++)
{
switch(inputs.charAt(i))
{
case 'i':
case 'I':
break;
case 'v':
case 'V':
break;
case 'x':
case 'X':
break;
case 'l':
case 'L':
break;
case 'c':
case 'C':
break;
case 'd':
case 'D':
break;
case 'm':
case 'M':
break;
default:
System.out.println("Not a valid roman numeral. "+inputs.charAt(i)+" does not belong.\n");
System.exit(0);
}
}

//Further checking, do we have too many numerals in a row? Rule 1.
if(inputs.contains("IIII"))
{
System.out.println("Not a valid roman numeral. There can only be 3 I's in a row.\n");
System.exit(0);
}
if(inputs.contains("XXXX"))
{
System.out.println("Not a valid roman numeral. There can only be 3 X's in a row.\n");
System.exit(0);
}
if(inputs.contains("CCCC"))
{
System.out.println("Not a valid roman numeral. There can only be 3 C's in a row.\n");
System.exit(0);
}
if(inputs.contains("MMMM"))
{
System.out.println("Not a valid roman numeral. There can only be 3 M's in a row.\n");
System.exit(0);
}

//if V L or D gets repeated. Rule 2.
if(inputs.contains("VV"))
{
System.out.println("Not a valid roman numeral. There can't be more than 1 V in a row.\n");
System.exit(0);
}
if(inputs.contains("LL"))
{
System.out.println("Not a valid roman numeral. There can't be more than 1 L in a row.\n");
System.exit(0);
}
if(inputs.contains("DD"))
{
System.out.println("Not a valid roman numeral. There can't be more than 1 D in a row.\n");
System.exit(0);
}

//The '1' symbols ('I', 'X', and 'C') can only be subtracted from the 2 next highest
//values ('IV' and 'IX', 'XL' and 'XC', 'CD' and 'CM'). Rule 3.
if(inputs.contains("IC") || inputs.contains("IL") || inputs.contains("ID") || inputs.contains("IM"))
{
System.out.println("Not a valid roman numeral. When I precedes, only IV and IX are valid.\n");
System.exit(0);
}
if(inputs.contains("XD") || inputs.contains("XM"))
{
System.out.println("Not a valid roman numeral. When X undercuts, only XL and XC are valid.\n");
System.exit(0);
}

//Only one subtraction allowed per numeral, XC is valid, XXC is not. Rule 4.
if(inputs.contains("IIV") || inputs.contains("IIX") ||
inputs.contains("XXC") || inputs.contains("CCD") || inputs.contains("CCM"))
{
System.out.println("Not a valid roman numeral. No double undercutting.\n");
System.exit(0);
}

//Rule 5: V, L, D can never be used to subtract.
if(inputs.contains("VX") || inputs.contains("VL") || inputs.contains("VC") ||
inputs.contains("VD") || inputs.contains("VM") || inputs.contains("LC") ||
inputs.contains("LD") || inputs.contains("LM") || inputs.contains("DM"))
{
System.out.println("Not a valid roman numeral. V, L and D cannot undercut.\n");
System.exit(0);
}


//start of converting the values.
//start of C's
if(inputs.contains("CM"))
{
arabic += 900;
System.out.print(" 900");
}
if(inputs.contains("CD"))
{
arabic += 400;
System.out.print(" 400");
}
if(inputs.contains("CCC"))
{
arabic += 300;
System.out.print(" 300");
}
if(inputs.contains("CC") && !inputs.contains("CCC"))
{
arabic += 200;
System.out.print(" 200");
}
if(inputs.contains("C") && (!inputs.contains("CD") && !inputs.contains("CM")) &&
!inputs.contains("CCC") && !inputs.contains("CC") && !inputs.contains("XC"))
{
arabic += 100;
System.out.print(" 100");
} //end of C's

//D
if(inputs.contains("DCCC"))
{
arabic += 800;
System.out.print(" 800");
}
if(inputs.contains("DCC"))
{
arabic += 700;
System.out.print(" 700");
}
if(inputs.contains("DC"))
{
arabic += 600;
System.out.print(" 600");
}
if(inputs.contains("CD"))
{
arabic += 400;
System.out.print(" 400");
}
if(inputs.contains("D") && (!inputs.contains("CD") && !inputs.contains("DC")))
{
arabic += 500;
System.out.print(" 500");
}

//start of X's
if(inputs.contains("XC"))
{
arabic += 90;
System.out.print(" 90");
}
else if(inputs.contains("XL"))
{
arabic += 40;
System.out.print(" 40");
}
else if(inputs.contains("XXX"))
{
arabic += 30;
System.out.print(" 30");
}
else if(inputs.contains("XX") && !inputs.contains("XXX"))
{
arabic += 20;
System.out.print(" 20");
}
else if(inputs.contains("X") && (!inputs.contains("XC") && !inputs.contains("XL")) &&
!inputs.contains("XXX") && !inputs.contains("XX"))
{
arabic += 10;
System.out.print(" 10");
} //end of X's

//L
if(inputs.contains("L") && !inputs.contains("XL"))
{
arabic += 50;
System.out.print(" 50");
}

//V
if(inputs.contains("IV"))
{
arabic += 4;
System.out.print(" 4");
}
else if(inputs.contains("V"))
{
arabic += 5;
System.out.print(" 5");
}

//I
if(inputs.contains("IX"))
{
arabic += 9;
System.out.print(" 9");
}
else if(inputs.contains("III"))
{
arabic += 3;
System.out.print(" 3");
}
else if(inputs.contains("II") && !inputs.contains("III"))
{
arabic += 2;
System.out.print(" 2");
}
else if(inputs.contains("I") && (
!inputs.contains("III") &&
!inputs.contains("II") &&
!inputs.contains("IV") &&
!inputs.contains("IX") ))
{
arabic += 1;
System.out.print(" 1");
}

//M
int count = inputs.length() - inputs.replace("M", "").length();
if(inputs.contains("CM"))
count--;
arabic += count*1000;

System.out.print(" M-Count is: "+count+".\n");
System.out.print("Converted number is: "+arabic+".\n");

//CMDCXXXVIII = 900+600+30+8=1538

}
}
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