package array;

/**

* @author qiaoying

* @date 2018/9/28 16:26

*/

public class IntToRoman {

public static String intToRoman(int num) {

String str = "";

int i = 1, n;

while (num > 0){

n = num % 10;

num /= 10;

str = intoCharacter(n , i).concat(str);

i++;

}

return str;

}

public static String intoCharacter(int n, int i){

String str1, str2, str3;

String str = "";

if (1 == i){

str1 = "I";

str2 = "V";

str3 = "X";

}else if (2 == i){

str1 = "X";

str2 = "L";

str3 = "C";

}else if (3 == i){

str1 = "C";

str2 = "D";

str3 = "M";

}else {

str1 = "M";

str2 = "";

str3 = "";

}

switch(n){ //switch对各数字进行组合以个位上的数举例如下

case 0:break; //空

case 1:str+=str1;break; //I

case 2:str+=str1+str1;break; //II

case 3:str+=str1+str1+str1;break;//III

case 4:str+=str1+str2;break; //IV

case 5:str+=str2;break; //V

case 6:str+=str2+str1;break; //VI

case 7:str+=str2+str1+str1;break; //VII

case 8:str+=str2+str1+str1+str1;break; //VIII

case 9:str+=str1+str3;break; //IX

}

return str;

}

public static void main(String[] args){

int num = 58;

String s = intToRoman(num);

System.out.println(s);

}

}