Algorithms—12.Integer to Roman

public class Solution {

    public String intToRoman(int num) {

      String a = "";
String b = "";
String c = "";
String d = "";
int ia = num / 1000;
int ib = (num / 100) % 10;
int ic = (num / 10) % 10;
int id = num % 10;
switch (id) {
case 0:
d = "";
break;
case 1:
d = "I";
break;
case 2:
d = "II";
break;
case 3:
d = "III";
break;
case 4:
d = "IV";
break;
case 5:
d = "V";
break;
case 6:
d = "VI";
break;
case 7:
d = "VII";
break;
case 8:
d = "VIII";
break;
case 9:
d = "IX";
break;
default:
break;
}
switch (ic) {
case 0:
c = "";
break;
case 1:
c = "X";
break;
case 2:
c = "XX";
break;
case 3:
c = "XXX";
break;
case 4:
c = "XL";
break;
case 5:
c = "L";
break;
case 6:
c = "LX";
break;
case 7:
c = "LXX";
break;
case 8:
c = "LXXX";
break;
case 9:
c = "XC";
break;
default:
break;
}
switch (ib) {
case 0:
b = "";
break;
case 1:
b = "C";
break;
case 2:
b = "CC";
break;
case 3:
b = "CCC";
break;
case 4:
b = "CD";
break;
case 5:
b = "D";
break;
case 6:
b = "DC";
break;
case 7:
b = "DCC";
break;
case 8:
b = "DCCC";
break;
case 9:
b = "CM";
break;
default:
break;
}
switch (ia) {
case 0:
a = "";
break;
case 1:
a = "M";
break;
case 2:
a = "MM";
break;
case 3:
a = "MMM";
break;
default:
break;
}
return a+b+c+d;

    }

}