HDOJ 1335 Basically Speaking

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HDACM1335
水…

import java.util.Scanner;public class Main{    static char c[] = {'0','1','2','3','4','5','6','7'                     ,'8','9','A','B','C','D','E','F'};    public static void main(String[] args) {        Scanner sc = new Scanner(System.in);        while (sc.hasNext()) {            String num = sc.next();            int n = sc.nextInt();            int m = sc.nextInt();            System.out.printf("%7s",hexConversion(num, n, m));            System.out.println();        }        sc.close();    }    public static String hexConversion(String num , int n , int m){        char ch[] = num.toCharArray();        int sum = 0;        for (int i = ch.length-1; i >=0 ; i--) {            for (int j = 0; j < n; j++) {                if (ch[i]==c[j]) {                    sum += j*(int)Math.pow(n, ch.length-i-1);                }            }        }        num = "";        while (sum>0) {            num = c[sum%m]+num;            sum /= m ;        }        if (num.length()<8) {            return num;        }        return "ERROR";    }}