November 7th, 2003, 10:55 AM
Help With A Problem!
Hello to all!
I'm really sorry to bother you all but I'm banging my head with this task from at least a week and I don't know how to solve this problem
Basically I'm using HOPE language (I hope that anyone here is a bit familiar with this functional language!!) and my task is to define a function call precedens which takes two words and evaluates to true if the 1st word is alphabetically less than the second but both words have to be coverted in capital using a function called shout.
I have to use 2 functions within the function precedens which I defined but I cannot link them all in one
This is what I've done up to now...
dec islower : char ->truval;
--- islower x<= (x>='a') and (x=<'z');
dec convforlower : char->char;
--- convforlower x<= chr(ord(x)-32);
dec convtoupper : char->char;
--- convtoupper x<= if islower x = true
then convforlower x
the functions above will check if a character is in lower case and if it is this char will be converted in upper case.
The one below using the above functions will convert a list of char into uppercase and this is one of the 2 function that I have to use in precedens.
dec shout : list char ->list char;
--- shout nil<= nil;
--- shout (h::tail)<= convtoupper h :: shout(tail);
The one below is the 2nd function that I have to use in precedens
that will get two list of char (2 words) and will check if the 1st word is alphabetically less then the 2nd.
dec pre : list char # list char -> truval;
--- pre (anylist, nil)<= false;
--- pre (nil, h2::tail2)<=true;
--- pre (h1::tail1, h2::tail2) <= if h1=h2
then pre (tail1, tail2)
This is the one that doesn'e work!!
This function will get 2 lists of char and check if the 1st one is alphabetically less then the 2nd. However before I can do this I have to connvert every char into uppercase... and this is my BIG PROBLEM!!!!
dec precedens : list char # list char ->truval
--- precedens (h1::tail1, h2::tail2)<= shout (h1:: tail1)
shout (h2:: tail2)
pre (h1::tail1, h2::tail2);
I really hope that someone will give me a bit of help!!
THANK YOU VRY MUCH IN ADVANCE!!!!
November 7th, 2003, 11:16 AM
I'd be happy to help, unfortunatly i've never heard of HOPE.. a quick search on google also turned up nothing (except a few referances to Pascal). If you have a few links i could read up on it and maybe give you a hand, no promises
Oh while i think about it you may get a better responce if you post this in the general forum, surly somone on devshed must know this lang'
November 7th, 2003, 12:05 PM
November 7th, 2003, 12:09 PM
Hi thanks a lot!
I know there is not a lot on the net about this lang'
I'm studing it I guess because of the strong use of functions...
Anyway where do you think i could post this message?
I had a look but there is just a list of different languages...
I'll try to find something that can give you a bit more of help...
November 7th, 2003, 12:15 PM
Re: Help With A Problem!
Try this.. you might need to edit it since I don't know the language. I've used other functional languages before tho.
Notice the fact I spent time on thinking of a function name that explains the function almost entirely and so you don't need to read any comments or the code to understand what it does. Make this a habbit. The few seconds spent on it saves enourmous time later when u have to read large programs to understand what it all does and how it works.
dec isLower : char -> truval;
--- isLower x<= (x>='a') and (x=<'z');
dec upperChar : char -> char;
--- upperChar x<= if isLower x = true
dec upperStr : list char -> list char;
--- upperStr nil <= nil;
--- upperStr (h::t) <= upperChar h :: upperStr(t);
dec compare : list char # list char -> truval;
--- compare (anylist, nil) <= false;
--- compare (nil, anylist) <= true;
--- compare (h1::t1, h2::t2) <= if h1=h2
then compare (t1, t2);
else h1 < h2;
dec precedens : list char # list char -> truval
--- precedens (list1, list2)<= upperStr list1
compare (list1, list2);