Convert roman number to decimal number: 1st commit

Author: paulsagar1a

string/RomanToDecimal.java

@@ -0,0 +1,50 @@
+package string;
+
+public class RomanToDecimal {
+
+	private int getDecimalValue(char ch) {
+		if(ch == 'I') 
+			return 1;
+		if(ch == 'V')
+			return 5;
+		if(ch == 'X')
+			return 10;
+		if(ch == 'L')
+			return 50;
+		if(ch == 'C')
+			return 100;
+		if(ch == 'D')
+			return 500;
+		if(ch == 'M')
+			return 1000;
+		return -1;
+	}
+	
+	private int getDecimal(String roman) {
+		int decimal = 0;
+		int length = roman.length();
+		for(int i=0; i<length; i++) {
+			int num1 = getDecimalValue(roman.charAt(i));
+			if(i+1 < length) {
+				int num2 = getDecimalValue(roman.charAt(i+1));
+				if(num1 < num2) {
+					decimal += num2 - num1;
+					i++;
+				} else {
+					decimal += num1;
+				}
+			} else {
+				decimal += num1;
+				i++;
+			}
+		}
+		return decimal;
+	}
+	
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		RomanToDecimal obj = new RomanToDecimal();
+		System.out.println(obj.getDecimal("DIX"));
+	}
+
+}