new semester here we go

338/roman/Roman.java

@@ -0,0 +1,127 @@
+import java.util.Scanner;
+/**
+ * Roman numerals 
+ *    I  1 
+ *    V  5
+ *    X  10
+ *    L  50
+ *    C  100
+ *    D  500
+ *    M  1000
+ * 
+ *    Numbers are written in decreasing value
+ *    Example:    XII is 12, not IIX or IXI
+ *    
+ *    But there are  special rules:
+ *    I can come before V or X  IV = 4,  IX = 9
+ *    X can come before L or C  XL = 40, XC = 90
+ *    C can come before D or M  CD = 400 CM = 900
+ */
+public class Roman {
+
+	public static String intToRoman(int n) {
+		String ret = "";
+		int val = n;
+		// dealing with the thousands case
+		if(n > 1000) {
+			int m = val / 1000; 
+			for(int i =0;i<m;i++) {
+				ret += "M";
+				val -= 1000;
+			}
+		}
+		// 900 case
+		if(val>=900) {
+			ret += "CM";
+			val -= 900;
+		}
+		// 600-800 range
+		if(val>=600) {
+			int c = (val - 500)/100;
+			for(int i =0;i<c;i++) {
+				ret += "C";
+			}
+			val -= 500;
+		}
+		// special case 500
+		if(val>=500) {
+			ret += "D";
+			val -= 500;
+		}
+		// 400 special case
+		if(val>=400) {
+			ret +="CD";
+			val -= 400;
+		}
+		// 100 - 300 range
+		if(val>=100) {
+			int x = (val - 100)/100;
+			for(int i =0;i<x;i++) {
+				ret += "X";
+			}
+			val -= 100;
+		}
+		// sub 100 range now
+		// 90 special case first
+		if(val>=90) {
+			val -=90;
+			ret += "XC";
+		}
+		if(val>=50) {
+			ret += "L";
+			int L=(val-50)/10;
+
+			for(int i =0;i<L;i++) {
+				ret += "X";
+			}
+			val -= 50;
+		}
+		if(val>=40) {
+			ret += "XL";
+			val -= 40;
+		}
+		if(val>=10) {
+			int x = (val - 10)/10;
+			for(int i =0;i<x;i++) {
+				ret += "X";
+			}
+			val -= 10;
+		}
+		if(val==9) {
+			ret += "IX";
+			return ret;
+		}
+		if(val>5){
+			int c = (val - 5);
+			for(int i =0;i<c;i++) {
+				ret += "I";
+			}
+			val -=5;
+		}
+		if(val==5) {
+			ret += "V";
+			return ret;
+		}
+		if(val==4) {
+			ret += "IV";
+			return ret;
+		}
+		return ret;
+
+	}
+	public static void main(String[] args) {
+		Scanner in = new Scanner(System.in);
+		while (true) {
+			System.out.print("Enter Roman Number or q for quit. ");
+			String x = in.nextLine();
+			if (x.equals("q"))
+				return;
+
+			// now we deal with normal cases
+			int n = Integer.parseInt(x);
+			System.out.println(n + " : " + intToRoman(n));
+		}
+
+	}
+
+}

338/roman/makefile

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+cc=~/Downloads/jdk-11.0.2/bin/javac
+fxlib=--module-path /home/shockrah/Downloads/javafx-sdk-11.0.2/lib
+ctrl=--add-modules javafx.controls
+
+env=~/Downloads/jdk-11.0.2/bin/java
+jfile="Roman.java"
+cfile="Roman"
+
+default:
+	# takes a java file as entry to build
+	#$(cc) $(fxlib) $< $(ctr)
+	$(cc) $(jfile)
+
+
+# ouchie
+run:
+	#$(env) $(fxlib) $(ctrl) $(cfile)
+	$(env) $(cfile)
+
+clean:
+	rm -f *class