字典的运用

给定一个整数 $num$，将整数转换成罗马数字。
如 $1,2,3,4,5$ 对应的罗马数字分别为I，II，III，IV，V等，更详细的说明见此 链接。
输入格式
第一行输入一个整数 $num(1\le num\le 3999)$。
输出格式
输出 $num$ 对应的罗马数字。
样例输入
123
样例输出
CXXIII
c={0:("","I","II","III","IV","V","VI","VII","VIII","IX"),   1:("","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"),   2:("","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"),   3:("","M","MM","MMM")}num1=int(input())roman=[]roman.append(c[3][num1//1000%10])roman.append(c[2][num1//100%10])roman.append(c[1][num1//10%10])roman.append(c[0][num1%10])s=''for i in roman:s=s+iprint(s)

java语言:

import java.util.Scanner;public class Main {public static void main(String[] args) {String [][]arr={{"","I","II","III","IV","V","VI","VII","VIII","IX"},                  {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"},                  {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"},                  {"","M","MM","MMM"}}; Scanner sc =new Scanner(System.in); int t;while(sc.hasNext()) {t=sc.nextInt();String str="";str+=arr[3][t/1000];str+=arr[2][t/100%10];str+=arr[1][t/10%10];str+=arr[0][t%10];System.out.println(str);}}}