题解 | #进制转换#

import java.util.Scanner;

public class Trans16_10 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String string = null;
        // 注意 hasNext 和 hasNextLine 的区别
        while (scanner.hasNext()) { // 注意 while 处理多个 case
            string = scanner.next();
            System.out.println("当前读取到为：" + string);
            int ans = 0;
            int length = string.length();
            for (int i = length - 1; i > 1; i--) {
                ans = (int) (ans + chatInt(string.charAt(i)) * (Math.pow(16, length - i - 1)));
                //Math.pow(a,b):a^b.返回值为double，强转为int
                System.out.println("当前数字乘以16后的结果：" + ans);
            }
            System.out.println(ans);
        }
    }

    private static int chatInt(char c) {
        System.out.println("当前字母为：" + c);
        if ((c >= '0') && (c <= '9')) {
            return c - '0';
        } else {
            int num = c - 'A' + 10;
            System.out.println("当前字母代表的数字为：" + num);
            return num;
        }
    }
}