/*
 * An intro to the workings and built-in keywords of Java
 */

import java.lang.Math;        // allows us to use the Math class of the library
import java.util.Scanner;     // ditto for the input Scanner class

class JavaInteraction
{

  public static void main(String[] args)
  {
    Scanner inputter = new Scanner( System.in );
    
    // a small user-interaction loop
    while (true)
    {
      System.out.print("\nAsk me anything! > ");
      String user_line = inputter.nextLine();   // a Scanner method returning a whole line
      System.out.println("You typed: "  + user_line);
      System.out.println("Your line had "  + user_line.length() + " characters.");
      System.out.println("If you were shouting, it'd be "  
                           + user_line.toUpperCase() + "\n");
      
      System.out.print("Checking if your input was a palindrome with spaces   : " 
                         + isPal(user_line) + "\n");
      
      /*
       * these are lines to use once you write the three methods
       *   isPalNoSpace
       *   canEval
       *   eval
      System.out.print("Checking if your input was a palindrome without spaces: " 
                         + isPalNoSpace(user_line) + "\n");
      System.out.print("Checking if your input can be evaluated: " 
                         + canEval(user_line) + "\n");
      if (canEval(user_line))
      {
        int value = eval( user_line );
        System.out.println( "Your line evaluates to " + value );
      }
      */
        
      if (user_line.equals("quit"))
      {
        break;  // get out of the while (true) loop!
      }
    }
    // Your task: create a more capable conversationalist!
    //   - palindromes, using a function
    //   - a small calculator
    //   - anything else you'd like...
    
    
    
    
    
    
  } // end of the main method
    
 
    
  /*
   * These functions should be commented with a few lines explaining
   *   - the name and its purpose
   *   - details on the inputs
   *   - details on what it outputs
   */
  
  // function: isPal, checking for palindromes
  // inputs: a String, s, the input to check
  // output: true or false, whether s is a palindrome
  //
  // This is not quite correct -- be sure to fix it!
  //
  public static boolean isPal(String s)
  {
    int L = s.length();
    if (L < 2) return true;
    if (s.charAt(0) != s.charAt(L-1)) return false;
    return true;
  }
  

}