Hi, That would not be considered an "example" for at least two reasons. Do you see why? <blockquote type="cite">On Nov 9, 2010 12:17 PM, "Peter Breitsprecher" <<a href="mailto:pkbreits@lakeheadu.ca">pkbreits@lakeheadu.ca</a>> wrote: As an example, I want have most of the functions for Plus, Minus already written. Here is the code for it. (define (plus num1 num2) (+ num1 num2)) That is childs stuff... Here is where I am having the problem, and please keep in mind I am new to DrRacket... If my program accepts input such as (plus 13 5) I need to parse it so that I know what it is asking for. If It is a left parent, then I need to move on, if it is a right parent, move on to the next character, once i get to the next character I can see it is an alphanumeric character, but then I need to somehow read the whole word, so that I can store that value in a variable so that I can read the next number. If the numbers are single digits, it is easy, because they are only one charater each and read-char works perfect, but I need something like a read-word, or read-number and I can't seem to figure out how to do it. So really I need to know how do I read the words when there are characters present, and read the whole numbers when there is a number present. On 9 November 2010 15:00, John Clements <<a href="mailto:clements@brinckerhoff.org">clements@brinckerhoff.org</a>> wrote: > > > On Nov 9, 2010, a...-- Kurt Breitsprecher (807) 474-9601 <a href="mailto:pkbreits@lakeheadu.ca">pkbreits@lakeheadu.ca</a> _________________________________________________ For list-related administrative tasks: <a href="http://lists.racket-lang.org/listinfo/users" target="_blank">http://lists.racket-lang.org/listinfo/users</a> </blockquote>