Int to Roman

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public class Solution {    public String intToRoman(int num) {        StringBuilder stringBuilder = new StringBuilder("");int c = num/1000;num %= 1000;for(int i = 0; i < c; i++){stringBuilder.append("M");}c = num / 100;num %= 100;switch (c) {case 9:stringBuilder.append("CM");break;case 8:stringBuilder.append("DCCC");break;case 7:stringBuilder.append("DCC");break;case 6:stringBuilder.append("DC");break;case 5:stringBuilder.append("D");break;case 4:stringBuilder.append("CD");break;case 3:stringBuilder.append("CCC");break;case 2:stringBuilder.append("CC");break;case 1:stringBuilder.append("C");break;default:break;}// I(1)，V(5)，X(10)，L(50)，C(100)，D(500)，M(1000)c = num /10;num %= 10;switch (c) {case 9:stringBuilder.append("XC");break;case 8:stringBuilder.append("LXXX");break;case 7:stringBuilder.append("LXX");break;case 6:stringBuilder.append("LX");break;case 5:stringBuilder.append("L");break;case 4:stringBuilder.append("XL");break;case 3:stringBuilder.append("XXX");break;case 2:stringBuilder.append("XX");break;case 1:stringBuilder.append("X");break;default:break;}// I(1)，V(5)，X(10)，L(50)，C(100)，D(500)，M(1000)switch (num) {case 9:stringBuilder.append("IX");break;case 8:stringBuilder.append("VIII");break;case 7:stringBuilder.append("VII");break;case 6:stringBuilder.append("VI");break;case 5:stringBuilder.append("V");break;case 4:stringBuilder.append("IV");break;case 3:stringBuilder.append("III");break;case 2:stringBuilder.append("II");break;case 1:stringBuilder.append("I");break;default:break;}return stringBuilder.toString();    }}
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