part7

package com.epam.rd.java.basic.practice1;

public class Part7 {

    public static void main(String[] args) {
        System.out.println(str2int("AAA"));
        System.out.println(int2str(26));
        System.out.println(rightColumn("AAA"));
    }

    public static int str2int(String number) {
        int actualNumber = 0;
        char[] numberChars = number.toCharArray();
        for (int i = 0; i < numberChars.length; i++) {
            actualNumber += (numberChars[i] - 64) * Math.pow(26, numberChars.length - i - 1);
        }
        return actualNumber;
    }

    public static String int2str(int number) {
        StringBuilder chars = new StringBuilder();

        int reminder;
        while (number > 0) {
            if (number <= 26) {
                chars.append((char) (number + 64));
                number = 0;
            } else {
                reminder = number % 26;
                chars.append((char) (reminder + 64));
                number = number / 26;
            }
        }

        return chars.reverse().toString();
    }

    public static String rightColumn(String number) {
        return int2str(str2int(number) + 1);
    }
}