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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;     } }

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