题解 | #进制转换#
进制转换
http://www.nowcoder.com/practice/8f3df50d2b9043208c5eed283d1d4da6
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (in.hasNext()) {
String str = in.next();
char[] arr = str.toCharArray();
if (arr[0] == '0' && arr[1] == 'x') {
int x=进制转换(arr);
System.out.println(x);
}
}
}
public static int 进制转换(char[] ary) {
int COUNT = 0;
int k=0;
for (int i = ary.length - 1; i >= 2; i--) {
COUNT = (int)(当前字符数值(ary[i]) *Math.pow(16,k )+ COUNT);
k++;
}
return COUNT;
}
public static int 当前字符数值(char sh) {
int cnt=0;
switch (sh) {
case '0':cnt= 0;break;
case '1':cnt= 1;break;
case '2':cnt= 2;break;
case '3':cnt= 3;break;
case '4':cnt= 4;break;
case '5':cnt= 5;break;
case '6':cnt= 6;break;
case '7':cnt= 7;break;
case '8':cnt= 8;break;
case '9':cnt= 9;break;
case 'A':cnt= 10;break;
case 'B':cnt= 11;break;
case 'C':cnt= 12;break;
case 'D':cnt= 13;break;
case 'E':cnt= 14;break;
case 'F':cnt= 15;break;
}
return cnt;
}
}
