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Converting Integers to Roman Numerals - Java


     Roman Number are a system of numerical notations used by the Romans.

1= I
5= V
10= X
50= L
100= C
500= D
1000= M = I
5000V
10,000X
50,000L
100,000C = I
500,000D = V
1,000,000M = X
5,000,000V = L
10,000,000X = C
50,000,000L = D
100,000,000 C = M
500,000,000 D
1,000,000,000M
nn = 1000×nnnn = 100,000×nnnn = 1,000,000×nn

                                                                                                                                                            























import java.util.*; class RomanCounting { public static void main(String[] args) { int num; System.out.println("please the number smallest than 999999"); System.out.println("According to automated program show 5000 as |V| and 10000 as |X| " + "and \n 50000 " + "as |L| and 100000 as |C| and 500000 as |D| and last as 1000000 as |M| "); Scanner obj = new Scanner(System.in); num = obj.nextInt(); String str = String.valueOf(num); char []arr = str.toCharArray(); int len = str.length(); int count[] = new int[10]; for(int i=0;i<len;i++){ count[i] = (int)arr[i]-48; } String ones[] = new String[]{"","I","II","III","IV","V","VI","VII","VIII","IX","X"}; String tens[] = new String[]{"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC","C"}; String hundred[] = new String[]{"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM","M"}; String thousand[] = new String[]{"","M","MM","MMM","MMMM","|V|","|V|M","|V|MM","|V|MMM", "M|X|","|X|"}; String TenThousand[] = new String[]{"","|X|","|X||X|","|X||X||X|","|X||L|","|L||X|", "|L||X||X|","|L||X||X|","|C||L|","|C|"}; String[] HundredThousand = new String[]{"","|C|","|C||C|","|C||C||C|","|C||D|","|D|", "|D||C|","|D||C||C|","|D||M|","|M|"}; if(len==6){ String romancounting = HundredThousand[count[0]]+ TenThousand[count[1]]+ thousand[count[2]] + hundred[count[3]] + tens[count[4]] + ones[count[5]]; System.out.println(romancounting); } else if(len==5){ String romancounting = TenThousand[count[0]]+ thousand[count[1]]+ hundred[count[2]] + tens[count[3]] + ones[count[4]]; System.out.println(romancounting); } else if(len==4){ String romancounting = thousand[count[0]]+ hundred[count[1]] + tens[count[2]] + ones[count[3]]; System.out.println(romancounting); } else if(len==3) { String romancounting = hundred[count[0]]+tens[count[1]]+ones[count[2]]; System.out.println(romancounting); } else if(len==2){ String romancounting = tens[count[0]]+ones[count[1]]; System.out.println(romancounting); } else{ System.out.println("Sorrt But number is invalid! OutOfRangešŸ‘Œ"); } System.out.println("Thanks for using your automated software"); } }

For Output : OUTPUT

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