import java.util.Scanner;

class Atoi_Elegant
{
   /* ---
      parseInt(s): Ascii to Integer conversion function
      --- */
   public static int myParseInt(String s)
   {
      int  value, sign;
      int  pos;

      /* -------
         Check for negative sign
         ------- */
      if (s.charAt(0) == '-')
      { sign = -1;
        pos = 1;           // Start at digit s.charAt(1)
      }
      else
      { sign = 1;
        pos = 0;           // Start at digit s.charAt(0)
      }

      /* ------------------------------------------
         Compute the absolute value of the number
         ------------------------------------------ */
      value = 0;
      for (int k = pos; k < s.length(); k++)
      { 
         value = 10*value + ( s.charAt(k) - 48 );  // High school knowledge....
      }

      /* -------------------------------------------------
         Adjust sign if necessary (sign = 1 or -1 !!!)
         ------------------------------------------------- */
      return(sign*value);      // Return a BINARY 2's compl code 
   }

   public static void main(String[] args) 
   {
      Scanner in = new Scanner(System.in);

      String s1, s2;
      int i1, i2;

      System.out.print("Enter an integer (string) s1: ");
      s1 = in.next();
      System.out.println("We read the numeric string: \"" + s1 + "\"");

      i1 = myParseInt(s1);  // Same effect as: i1 = Integer.parseInt(s1); !!!!

      System.out.println("The integer VALUE for this numeric string is: " + i1);


      System.out.print("\nEnter another integer (string) s2: ");
      s2 = in.next();
      System.out.println("We read the numeric string: \"" + s2 + "\"");

      i2 = myParseInt(s2);  // Same effect as: i1 = Integer.parseInt(s1); !!!!

      System.out.println("The integer VALUE for this numeric string is: " + i2);

      System.out.println("===================================================");
      System.out.println("The sum of the integer values = " + (i1+i2) );
   }
}