FORTH

• Stacks : Data , Return
  
  
• Definitions either code or in dictionary
  
  
• A word is string of characters delimited by whitespace
  
  
• Interpreter reads a word , looks it up in dictionary
  • If code execute it
  • If defined , look each word in definition in turn and interpret
  • If not found , parse as number and put on data stack
  • If not number , abort