Lesson 1011 Activity

/*
 * Lesson 1011 Coding Activity
 *
 * For this program you will input an int to represent the octal number
 * and translate to the base ten number. The octal number must be 8 digits or less.
 *
 * Your program should also check that all the digits are 0 - 7, then translate the
 * number to base ten.
 *
 * Sample Run 1:
 * Enter a number in base 8:
 * 1287
 * ERROR: Incorrect Octal Format
 *
 * Sample Run 2:
 * Enter a number in base 8:
 * 123
 * 83
 *
 * Sample Run 3:
 * Enter a number in base 8:
 * 1111111111
 * ERROR: Incorrect Octal Format
 *
 */

import java.util.Scanner;
import java.lang.Math;

class Lesson_1011_Activity{
    public static void main(String[] args)
     {
      Scanner scan = new Scanner (System.in);
      System.out.println("Please enter a number in base 8:");
      String x = scan.nextLine();
      int sum = 0;
      int flag = 0;
      if (x.length() > 8)
      {
        System.out.println("ERROR: Incorrect Octal Format");
      }
      else
      {
      for (int i = 0; i < x.length(); i++)
      {
        if (x.charAt(i) > 55)
        {
          System.out.println("ERROR: Incorrect Octal Format");
          flag++;
        }
      }
      if (flag == 0)
      {
        int a = x.length()-1;
        for(int i = 0; i < x.length(); i++)
        {
            System.out.println((x.charAt(i)-48)*(Math.pow(8, a)));
            sum += (x.charAt(i)-48)*(Math.pow(8, a));
            a--;
        }
        System.out.println(x.charAt(0)-48);
        System.out.println(sum);
      }

      }
}
}