java实现 洛谷 P1017 进制转换

import java.util.Scanner;
 
public class Main {
	private static Scanner cin;
	
	public static void main(String args[]) throws Exception {
		cin = new Scanner(System.in);
		int n = cin.nextInt();
		int r = cin.nextInt();
		int t = n;
		int modRet;
		StringBuilder sb = new StringBuilder("");
		while(t/r != 0 || t%r!=0) {
			modRet = t%r;
			//如果取模后结果为负数，t/r的结果需要向高位借1
			if(modRet < 0) {
				t = t/r + 1;
				modRet = modRet - r;
			}
			else {
				t = t/r;
			}
			sb.insert(0, modRet>9?(char)(modRet+55):(char)(modRet+48));
		}
		sb.insert(0,String.format("%d=", n));
		sb.append("(base"+r+")");
		System.out.println(sb.toString());
	}
}