【剑指offer】Excel2003中，用A表示第一列，B表示第二列，。。Z表示第26列，AA表示27列，AB表示第28列

import java.util.Scanner;

public class ExcelColumn {
public static void main (String[] args) {
Scanner input =new Scanner(System.in);
String message=input.nextLine();
int result=excelColumn(message);
System.out.println(result>0? "the string is placed in column "+result : "invalid input");

}

private static int excelColumn(String message) {
// TODO Auto-generated method stub
int result=0;
if(message==null||message.length()==0)
return -1;
else{
result=26*(message.length()-1);
for(int i=0;i<message.length();i++)
result+=message.charAt(i)-'A';
result=result+1;
}
return result;

}

}