Computer Science Canada

inclusive if statements
Author:  blankout [ Tue Apr 14, 2009 3:36 pm ]
Post subject:  inclusive if statements
I was wondering is it's possible to have an if statement that is inclusive, such as

Turing:

if answer="y"
then
%...


is it possible to have the user input a word and as long as the word has the letter y in it, the program will run a specific output?
Author:  Tony [ Tue Apr 14, 2009 3:46 pm ]
Post subject:  RE:inclusive if statements
you might be interested in index
Author:  blankout [ Tue Apr 14, 2009 3:54 pm ]
Post subject:  Re: inclusive if statements
so i tried using index, but i don't quite get it, if you can understand what i'm trying to do from this code, can i get any help?

Turing:

var word : string
get word : *
cls
put index (word, "a")
cls
if index (word, "a") then
put word(1..index(word, "a")-1)..
put "i"(index(word, "a")..length (word))
end if
Author:  Tony [ Tue Apr 14, 2009 4:07 pm ]
Post subject:  RE:inclusive if statements
index returns an integer value, not boolean (true/false).
Author:  TheGuardian001 [ Tue Apr 14, 2009 4:07 pm ]
Post subject:  Re: inclusive if statements
the index command returns an integer value based on where the letter was found in the string, or 0 if the letter was not found. so if we only need to know if the letter was found, what result would we check for?

Edit: Ninja'd by Tony.
Author:  blankout [ Tue Apr 14, 2009 4:09 pm ]
Post subject:  Re: inclusive if statements
well i'm trying to replace all 'a' s in a sentence with 'i's, so what would i need to do in order to produce that result
Author:  Tony [ Tue Apr 14, 2009 4:37 pm ]
Post subject:  RE:inclusive if statements
Start with simplifying the problem. Your teacher might have been saying something like that -- breaking problems down into smaller problems. "Command & Conquer", or something lame like that.

My favourite approach to such problems is recursion / induction.

All you have to do is figure out two things:
1. What is the most basic case for this problem.
2. How can you get one step closer to such a base case.

And those two steps are enough for any size of a problem, 1 to infinity (limited by hardware and time Wink )


1. What is the shortest sentence you can think of, where you would need to replace 'a'?
2. Given a sentence of any length (longer than one in #1), how can you get it to be one letter shorter?

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