描述
Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
分析
无
代码
1 public class IntegerToRoman { 2 3 public static void main(String[] args) { 4 // TODO Auto-generated method stub 5 int num = 187; 6 System.out.println(intToRoman(num)); 7 } 8 9 public static String intToRoman(int num) { 10 int radix[] = { 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 }; 11 String symbol[] = { "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I" }; 12 String roman = ""; 13 for (int i = 0; num > 0; ++i) { 14 int count = num / radix[i]; 15 num %= radix[i]; 16 for (; count > 0; --count) 17 roman += symbol[i]; 18 } 19 return roman; 20 } 21 22 }
看到有用递归的方法(转载)
1 public static String intToRoman2(int num) {
2 if(num>=1000) return "M"+intToRoman(num-1000);
3 if(num>=900) return "CM"+intToRoman(num-900);
4 if(num>=500) return "D"+intToRoman(num-500);
5 if(num>=400) return "CD"+intToRoman(num-400);
6 if(num>=100) return "C"+intToRoman(num-100);
7 if(num>=90) return "XC"+intToRoman(num-90);
8 if(num>=50) return "L"+intToRoman(num-50);
9 if(num>=40) return "XL"+intToRoman(num-40);
10 if(num>=10) return "X"+intToRoman(num-10);
11 if(num>=9) return "IX"+intToRoman(num-9);
12 if(num>=5) return "V"+intToRoman(num-5);
13 if(num>=4) return "IV"+intToRoman(num-4);
14 if(num>=1) return "I"+intToRoman(num-1);
15 return "";
16 }