<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7036.0"> <TITLE>Adding a list</TITLE> </HEAD> <BODY>  I'm very new to Scheme and need some help.  I'm trying to write a function that accepts an accumulating function(summation, product) and a list of numbers and returns the accumulation of the operation on each element of the list.  So, if '(1 2 3 4) was supplied to the function and an operation 'sum' that adds two elements the function would return the sum of the list. This is what I have started with and I keep getting an error: (define (doall fn l)   (if (null? (cdr l)           (list (fn(car l)))           (append (process_all fn(cdr l))(list fn(car l))))))   The error is this: if: bad syntax (has 1 part after keyword) in: (if (null? (cdr l) (list (fn (car l))) (append (process_all fn (cdr l)) (list fn (car l))))) I am trying to define the list with this function.  I suppose after I can get it to work, next I will work on the summation, product function.  First I need to get this list function to work.  Any ideas? Trista </BODY> </HTML>