任意進制轉換(2~36)---------------------------------Java 大數

import java.math.BigInteger;
import java.util.*;
public class Main{
	public static void main(String args[]) {
		Scanner scan=new Scanner(System.in);
		String str=scan.next();
		int a=scan.nextInt();
		int b=scan.nextInt();
		//a進制數轉爲b進制數
		String res=new BigInteger(str,a).toString(b);
		System.out.println(res);
	}
}