encrypting codes

[uknowhoiam]

my question that i have to answer is this

. Write a program to read in a phrase and encrypt this phrase using a basic ?Caesar? cipher. Caesar realized that messages could be hidden in encrypted text. He sent messages by shifting characters to encrypt the messages contents. Your program will read in a phrase and encrypt the phrase. The user will choose the character shift or a random number can be chosen for the character shift (between 1 and 25) .The original and encrypted phrases must be printed out.

This is what i got so far..

Turing:

var phrase : string := "" var number, char_shift, word, encrypt : int := 0 put "Enter a phrase" get phrase : * put "Enter a character shift" get char_shift % This loop will repeat untill the end of the phrase for count : 1 .. length (phrase)     encrypt := encrypt - 1     % Encrypt will equal to the phrase in an integer value     encrypt := ord (phrase (count))     % if encrypt is 'space' then ..     if encrypt = 32 then         % encrypt will be subtracted by char_shift         encrypt := encrypt - char_shift         % If encrypt is capital z then..     elsif encrypt = 90 then         % encrypt will go back and will be before A         encrypt := 64         % If encrtpy is z then..     elsif encrypt = 122 then         %encrypt will go back and will be before a         encrypt := 96     end if     %word will equal encrypt and will add the char_shift     word := encrypt + char_shift     put chr (word) .. end for

my problem is that, when encrypt is over lowercase z then it goes further in the ascii code (w/e is after z)
what i want is that i want it to go to capital A instead of going further

im stuck anyone want to help me

Mod Edit: Remember to use syntax tags! Thanks

code:

[syntax="Turing"]Code Here[/syntax]

[Insectoid]

perhaps 'if ord (letter) > ord(z) then however many characters it is past z + A'?. That made sense to me, but I doubt I explained it well.

You need to find out how far a letter is past ascii z and then add that much -1 to ascii A. So say it is at ascii 124, it is 2 more than z, so add 2-1 to A, to get a capital B. Remember that there is a few ascii characters between Z and a.

Oh, and Turing uses ansii (not that it makes too much difference).

[uknowhoiam]

ugh i handed my program in so now it doesnt matter if i edit it, but my teacher said it doesnt really matter if i get this question wrong cuz it is really hard, she wont cut marks off

[syntax_error]

Now you have 2 weeks(ish) to fix it, and learn if you wish to.

[Tyr_God_Of_War]

Turing:

elsif encrypt >= 90 then         % encrypt will go back and will be before A         encrypt :=encrypt-26

Would that work?

[SNIPERDUDE]

Tyr_God_Of_War @ December 19th 2008 wrote:

Turing:

elsif encrypt >= 90 then         % encrypt will go back and will be before A         encrypt :=encrypt-26

Would that work?

You could of just as easily made this line

Turing:

encrypt := encrypt - 26

this

Turing:

encrypt -= 26

for future reference. You just put the character before the equal so you don't have to repeat the variable name. So for example multiplying the variable Test by 3 would look like this:

Turing:

Test *= 3