题目
二十六进制和十进制之间转换。 使用字符-十进制之间的关系 a-1 b-2 … z-26 aa-27 ab-28 …. huawei-104680767
现在，输入字符串或者整数，要求输出对应的整数或者字符串。
思路
AC（通过70+%，没查出错误）
package test.test2;
import org.junit.Test;
/**
* description:
*
* @author liyazhou
* @since 2017-08-30 19:57
*/
public class Main {
@Test
public void test(){
String[] strs = {
"a",
"aa",
"aaa",
"ab",
"az",
"z",
"i",
"huawei",
"26",
"27",
"27",
"27",
"104680767",
};
for (String str: strs){
String result = convertTo26(str);
System.out.println(str +
" :: " + result);
}
}
public String
convertTo26(String str){
char[] chars = str.toCharArray();
String result =
"";
if (chars[
0] >=
'0' && chars[
0] <=
'9'){
result = numToStr(chars);
}
else{
result = strToNum(chars) +
"";
}
return result;
}
private String
numToStr(
char[] chars){
StringBuilder result =
new StringBuilder();
int num = Integer.valueOf(
new String(chars));
while (num !=
0){
int re = num %
26;
if (re >
0){
char r = (
char)(re + (
'a' -
1));
result.append(r);
}
num /=
26;
}
return result.reverse().toString();
}
private int strToNum(
char[] chars){
int num =
0;
int counter =
0;
int base =
1;
for (
int i = chars.length-
1; i >=
0; i --){
base =
1;
for (
int j =
0; j < counter; j ++){
base *=
26;
}
num += (chars[i] -
'a' +
1) * base;
counter ++;
}
return num;
}
}
