upper case need help

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

[Walter Roberson]

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

[Maria]

it works!! thanks! May I know why put lowercase there?

[Walter Roberson]

Your input might be either upper case or lower case, and you want the two to be treated the same way, and the rest of your code assumes it was lower case. That makes the easiest approach to just use lower() to convert uppercase to lowercase (leaving lowercase alone.)

[Image Analyst]

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