MATLAB: Upper case need help

Question

function unscramble=latinCipher(scramble)

[str,shift]=strtok(scramble,' ');

shift=str2num(shift);

str=char(mod(double(str)-97+shift,26)+97);

unscramble=upper(str);

end

for my this code, if I put lowercase 'sknz 4' it will output as 'WORD'. How could be fixed by puting uppercase 'SKNZ 4' would output as 'WORD". Because for now if I input 'SKNZ 4' it showed an unexpected value.

Answer 1

str=char(mod(double(lower(str))-97+shift,26)+97);