// Various Tokens for arithmetic expressions based on integers 
// with identifiers and assignments

public class Token {
  public int type;                   // token type
  public double value;               // numerical value for NUM
  public String str;                 // token string

  public static final int EOL=0;     // End Of Line
  public static final int PAL=1;     // Left Parenthesis
  public static final int PAR=2;     // Right Parenthesis
  public static final int ADD=3;     // operators
  public static final int SUB=4;
  public static final int MUL=5;
  public static final int DIV=6;
  public static final int NUM=7;     // number
  public static final int EQU=8;     // equal 
  public static final int LET=9;     // let
  public static final int ID=10;     // identifier
  public static final int END=11;    // exit
}