integer-to-roman
/**
*
* @author gentleKay
* Given an integer, convert it to a roman numeral.
* Input is guaranteed to be within the range from 1 to 3999.
*
* 给定一个整数,将其转换为罗马数字。
* 输入保证在1到3999之间。
*
* 了解一下罗马数字的写法:
* 1-9:1-Ⅰ、2-Ⅱ、3-Ⅲ、4-Ⅳ、5-Ⅴ、6-Ⅵ、7-Ⅶ、8-Ⅷ、9-Ⅸ。
* 10-20:10-Ⅹ、11-Ⅺ、12-Ⅻ、13-XIII、14-XIV、15-XV、16-XVI、17-XVII、18-XVIII、19-XIX、20-XX。
*/
这两题可以对比的进行学习:
roman-to-integer: https://www.cnblogs.com/strive-19970713/p/11250501.html
/** * * @author gentleKay * Given an integer, convert it to a roman numeral. * Input is guaranteed to be within the range from 1 to 3999. * * 给定一个整数,将其转换为罗马数字。 * 输入保证在1到3999之间。 * * 了解一下罗马数字的写法: * 1-9:1-Ⅰ、2-Ⅱ、3-Ⅲ、4-Ⅳ、5-Ⅴ、6-Ⅵ、7-Ⅶ、8-Ⅷ、9-Ⅸ。 * 10-20:10-Ⅹ、11-Ⅺ、12-Ⅻ、13-XIII、14-XIV、15-XV、16-XVI、17-XVII、18-XVIII、19-XIX、20-XX。 */ public class Main09 { public static void main(String[] args) { int num = 2345; System.out.println(Main09.intToRoman(num)); } public static String intToRoman(int num) { String one[]={"I","II","III","IV","V","VI","VII","VIII","IX"}; // 1-9 String ten[]={"X","XX","XXX","XL","L","LX","LXX","LXXX","XC"}; // 10 - 90 String hundred[]={"C","CC","CCC","CD","D","DC","DCC","DCCC","CM"}; // 100 - 900 String thous[]={"M","MM","MMM"}; // 1000 - 3000 String str = ""; if (num >= 1000) { str = str + thous[num/1000-1]; num = num%1000; } if (num >= 100) { str = str + hundred[num/100-1]; num = num % 100; } if (num >= 10) { str = str + ten[num/10-1]; num = num % 10; } if (num >= 1) { str = str + one[num-1]; } return str; } }