# [plt-scheme] help.... Me :)

plt-scheme at list.cs.brown.edu
Please Help
I used to create a program in ( PLT SCHEMES ) it is a set of intervals integers between two indicated numbers and my contain two numbers themselves :
Sample
r1 : 0 to 20
r2 : 2001 to 2008
" my problem is to set operation intervals "
( interval – length r2 )
7
(Interval-print- all r2 )
2002 2003 2004 2005 2006 2007 2008
(interval-combine r1 r2 ) or ( interval-combine r2 r1 )
makes an interval 0 to 2008
(interval-sum r1)
returns the sum of all elements
(interval-mid r1)
the middle number in interval. If length is even, return the lower mid
( interval- print r1 )
0,20
(interval-print-n r1 n)
prints first n elements of r1 ( less if length is lesser than n )
“ thanks for your brilliant ideas please help me : )) “
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