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Help - Lisp program to calculate the sum of first N positive integers

  1. Oct 21, 2007 #1
    1. The problem statement, all variables and given/known data

    Write a Lisp program to calculate the sum of the first N positive integers where, for example, when N = 6 the sum of the first N = 21.


    2. Relevant equations

    If you try this out in tlisp at http://www.ugcs.caltech.edu/~rona/tlisp/ please note that the syntax for N - 1 is (+ N -1).

    Or if you try it out in the console of Allegro Common Lisp from http://www.franz.com the syntax is (- N 1).

    If you define your function as, for example, nsum, then the syntax for calling it with N = 6 is (nsum 6)


    3. The attempt at a solution

    Ok, I am no programmer so I don't even know where to start. This is not a programming class so I am not sure where to start.

    Any help or direction would be appreciated!
     
  2. jcsd
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