【华为笔试】十六进制转换

 1 import java.util.Scanner;
 2 
 3 public class Main {
 4     public static void main(String[] args) {
 5         Scanner sc = new Scanner(System.in);
 6         while (sc.hasNext()) {
 7             String str = sc.nextLine();
 8             String str1 = str.substring(2);
 9             char[] ch = str1.toCharArray();
10             int n = ch.length;
11             int res = 0;
12             String ans;
13             for (int i = 0; i < ch.length; i++) {
14                 if (ch[i] >= ‘A‘ && ch[i] <= ‘F‘) {
15                     res += ((ch[i] - 55) * Math.pow(16, n - 1));
16                     n -= 1;
17                 }
18                 if (ch[i] >= ‘0‘ && ch[i] <= ‘9‘) {
19                     res += ((ch[i] - 48) * Math.pow(16, n - 1));
20                     n -= 1;
21                 }
22             }
23             ans = String.valueOf(res);
24             System.out.println(ans);
25         }
26     }
27 }