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?

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.

[Yao Li]

What is the correct result for 'apple'? zookd? Think about ASCII characters

[Sean]

the correct result for 'apple' should be bqqmf. I want to be able to input any words or group of ascii characters and have them shifted to the right 1 step in the alphabet:

'bass' = cbtt

'tree' = usff

etc.

[Yao Li]

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]

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?

Answer 1

[Friedrich]

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);

Answer 2

[Yao Li]

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;

[Yao Li]

I just shift z to a and Z to A.

I'm not sure whether it is what you want