Computer Science Canada

reversing words
Author:  baby_bubblz [ Tue Nov 23, 2004 8:43 pm ]
Post subject:  reversing words
hey can someone help me fill in the ??????? with reversing a word the user inputs? it'd be really helpful. thanks!

i think part of it goes something like this:

var word: string
var reverse: string

put "enter a word"
get word

for decreasing i: length(word) .. 1


????????????????
and i think there's something like word(length(word))?


end for
"the reversed word is " , put reverse
Author:  Cervantes [ Tue Nov 23, 2004 9:00 pm ]
Post subject: 
Right-o! Determining that you need to use a for loop and the length() function was the hard part!

So, if you want to simply output the reversed word on the screen, try this:
code:

var word : string
get word
put "the word reversed is " ..
for decreasing i : length (word) .. 1
    put word (i) .. %word (i) refers to the character in the string varaible, "word", at position i.
end for


If you actually want to save it to a variable, try this:

code:

var word : string
get word
var reversed : string := ""

for decreasing i : length (word) .. 1
    reversed += word (i) %note: this is the same as reversed := reversed + word (i)
end for
put "the word reversed is ", reversed


I hope that helped.
Author:  wtd [ Tue Nov 23, 2004 9:18 pm ]
Post subject: 
Also, consider the recursive solution:

code:
function reverseString (s : string) : string
    if s = "" then
        result s
    else
        result s (length (s)) + reverseString (s (1 .. length (s) - 1))
    end if
end reverseString
Author:  zylum [ Tue Nov 23, 2004 11:29 pm ]
Post subject: 
or simply :

code:
for decreasing i : length (word) - 1 .. 1
    word := word (1 .. i - 1) + word (i + 1 .. *) + word (i)
end for


Laughing
Author:  con.focus [ Sun Nov 28, 2004 7:52 pm ]
Post subject: 
code:
var word : string
var revesre : string := ""
put "type in a word: "..
get word
for decreasing i : length (word) .. 1
revesre += word (i)
end for
delay (500)
put " this is the reverse of your word"
put revesre


i think this is wut u were originally going for

:


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