题解 | #进制转换#
进制转换
https://www.nowcoder.com/practice/8f3df50d2b9043208c5eed283d1d4da6
import java.util.Scanner;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
String num = in.nextLine();
// System.out.println(num.substring(2));
char[] res = num.substring(2).toUpperCase().toCharArray();
int result = 0;
for (int i = res.length - 1; i >= 0; i--) {
int sq = (res.length - 1 - i);
int current = 0;
switch (res[i]) {
case 'A':
current = 10;
break;
case 'B':
current = 11;
break;
case 'C':
current = 12;
break;
case 'D':
current = 13;
break;
case 'E':
current = 14;
break;
case 'F':
current = 15;
break;
default:
current = Integer.valueOf(String.valueOf(res[i]));
}
result += current * Math.pow(16, sq);
// System.out.println("current="+current);
// System.out.println("sq="+sq);
// System.out.println("result="+result);
}
System.out.println(result);
}
}
