华为在线训练之16进制转换10进制

package test;
import java.util.List;
import java.util.Scanner;
import java.lang.Math;
import java.util.ArrayList;

public class Six {
	static int result;
	static String str;
	static List<Integer>list = new ArrayList<Integer>();
	public static void main(String[]args){
		Scanner sc = new Scanner(System.in);
		
		while(sc.hasNext()){
			
			str = sc.nextLine().trim().substring(2);
			
			for(int i=str.length();i>0;i--){
				Integer s = 0;
				
				switch(str.charAt(i-1)){
				
				case 'A':
					s = 10;
					break;
				case 'B':
					s = 11;
					break;
				case 'C':
					s = 12;
					break;
				case 'D':
					s = 13;
					break;
				case 'E':
					s = 14;
					break;
				case 'F':
					s = 15;
					break;
				default:
					
					s=Integer.parseInt(String.valueOf(str.charAt(i-1)));
//					System.out.println(s);
						
			
				}
				list.add(s);
//				System.out.println(list);
//				result = (int) (s* Math.pow(16,i));
//				System.out.println(str.length()-i);
				
//				System.out.println(result);
			}
			System.out.println(list);
			for(int i=0;i<str.length();i++)
				result += (int) (list.get(i)* Math.pow(16,i));
				
			System.out.println(result);
			list.clear();
			result =0;
			}
		}
	}