Inputting Units

I have a user inputting different units for temperature. However, I only want the program to be able to accept Capital letters, so if they put a lowercase, it would tell them to input it again. What would be the code for this? I have something like this right now. The while part needs fixing.

Unit = input('Enter the units of the inputted temperature:','s'); while Unit == c Unit == k Unit == f Unit == r Unit = input('Please enter the unit with a Capital Letter:','s'); end

Answer 1

[Image Analyst]

That's not user friendly. It would be very annoying to your users and I recommend you DON'T DO THAT, especially since it's not necessary at all. Just convert what they input to upper case with the upper() function, like this:

% Set up the dialog box parameters
prompt = {'Enter temperature:','Enter the temperature scale:'};
dialogTitle = 'Enter parameters';
numberOfLines = 1;
defaultAnswers = {'100','C'};
userResponse = inputdlg(prompt, dialogTitle, numberOfLines, defaultAnswers);
% Extract out individual variables from the user response.
temperature = str2double(userResponse{1})
% Convert to upper case.
EoSI = upper(userResponse{2})

[Kevin]

That works but I should have made it a little bit clearer, sorry about that. I need it where the only units I want to be accepted to be C,F,K or R, and that the program must check to make sure that the unit entered is one of those.

[Image Analyst]

Use a switch statement or an if/elseif/else block.

[Image Analyst]

Possibly a better option is to use menu() to allow them to pick ONLY one of the allowed options.

[Kevin]

I got the idea of using the if/elseif/else block but I'm just unsure of how to actually go about it