Thanks  doug and Joe,

I've got the answer now . I've used the trunc method for the simple reason that it's the one most easy to grasp( i.e with a minimum of  required maple -knowledge ).   

btw Doug, your questions were didacticly correct  , hence very useful , I  appreciate it.

Yoeri.  

Hi again ,

It seems that the "trunc-method" is only useful for linearly progressing endpoints . the intervals I really wanted to insert (and find out in which one is x ) are of the

form A_n = [10*n^3 , 10*(n+1)^3 ] with n ranging from 0 to9.  

How should I program this in maple?

I'm sorry for not being more specific earlier on but i thought that the method  I would receive would be applicable to this form  also, my bad.

thanks in advance,

Yoeri.

Sweet !

I can' t thank you enough Doug .

Thanks Acer and Joe , however I still have some questions left ( I've only been introduced to maple 2 weeks ago).

first of all the algorithm isn't required to be efficient , if it works , i'm one happy maple-user :).

secondly,   the intention is that I  find  an algorithm that finds the interval 'I' of which  a number ' x '( any integer smaller than 100) is part of. 

the intevals are as such: 

  A := [0,9] B:= [10,19],...j:= [90,99].

Can somebody give a shot at working this out?

My eternal gratitude to the one who does (it's a shitty prize , I know).

Ps : joe, thanks for your method , i tried working with it but didn't get far due to my lack of experience with Maple.