How do I create a function that takes a character array (s) as an input and returns a new character array with each letter shifted forward once in the alphabet?

25 views (last 30 days)
Assume that the input s will never contain the letter 'z'.
Example:
>> shiftletters('apple')
ans =
bqqmf
So far this is what I have and it must be because I'm an idiot but I can't get any further. Thank you in advance.
* function s = shiftletters('apple')
s=char('[A-Z]'+1);*
I believe my problem lies in the fact that I do not know how to correctly identify the letters of the alphabet into a single variable or array.
  4 Comments
Yao Li
Yao Li on 9 Apr 2013
Do you mean if the string is 12345abcdz23, the result should be 12345bcdea23? Currently, you function runs well except 'z' and the characters beyond alphabet. So before the shift, try to find out whether there are 'z' in the string and which charaters needs to be shifted.
irfan KHAN
irfan KHAN on 25 Dec 2020
can anyone help me in the following
Create a variable named str which contains the characters 'wxyz'. Shift it forwards by three characters (i.e., add 3 to the ascii code). What is the result?

Sign in to comment.

Accepted Answer

Friedrich
Friedrich on 9 Apr 2013
Edited: Friedrich on 9 Apr 2013
Hi,
you maybe need to think about the letter z/Z, but in general you can do:
function s = shiftletters(in)
s = char(in+1);
In the case z/Z should stay:
function s = shiftletters(in)
non_z = ~( (in=='z') | (in=='Z'));
s = in;
s(non_z) = char(in(non_z)+1);

More Answers (1)

Yao Li
Yao Li on 9 Apr 2013
Edited: Yao Li on 9 Apr 2013
function s=shiftletters(input_string)
for i=1:1:length(input_string)
if((double(input_string(i))>=65&&double(input_string(i))<=89)...
||(double(input_string(i))>=97&&double(input_string(i))<=121))
input_string(i)=char(input_string(i)+1);
elseif((double(input_string(i))==90)||(double(input_string(i))==122))
input_string(i)=char(input_string(i)-25);
end
end
s=input_string;

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!