任意进制转10进制

 1 import java.util.Scanner;
 2 
 3 public class Change {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7         Scanner cin = new Scanner(System.in);
 8         System.out.print("输入待转换的数和其进制：");
 9         int OldNum = cin.nextInt();//待转换成10进制的数
10         int x = cin.nextInt();//待转换数的进制
11         int num = change(OldNum, x);
12         System.out.println(num);
13     }
14     public static int change(int n, int x) {
15         int num = 0;
16         int k = 1;
17         while(n!=0) {
18             int m = n % 10;//取最后一位数
19             num += m * k;
20             n = n / 10;
21             k *= x;
22         }
23         return num;
24     }
25 }