create a caesar cipher in matlab

main.m
function cipher_text = caesar_cipher(plain_text, shift)
    % Convert plain text to uppercase
    plain_text = upper(plain_text);
  
    % Initialize cipher text
    cipher_text = '';
    
    % Iterate over each character in the plain text
    for i=1:length(plain_text)
        % Get the ASCII code of the current character
        char_code = uint8(plain_text(i));
        
        % Shift the character code by the specified shift amount
        shifted_code = char_code + shift;
        
        % Wrap around if the shifted code goes beyond 'Z' or 'A' (for uppercase alphabet)
        if shifted_code > 90
            shifted_code = shifted_code - 26;
        elseif shifted_code < 65
            shifted_code = shifted_code + 26;
        end
        
        % Convert the shifted character code back to a character and append it to the cipher text
        cipher_text = [cipher_text, char(shifted_code)];
    end
end
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