How do you write a nested if statement that checks if the user has entered certain numbers?

Hi all, I am trying to implement a way to check if a user has entered a certain number in an already nested if statement.

I am trying to have the user input a number, and if it falls under "badValues" array, then it either exits or goes back to beginning of program. Is there anyway this is possible? I have included the code here that is failing me.

I will shorten it because the other things are irrelevant, but it looks like:

if (modeSelected == 1)
    badValues = [8 43 55];
    correctRange = setdiff(0:100,badValues);
    isRandom = input('Type 1 for random index or 2 for user selected index:\n');
    if (isRandom == 1)
        % Random function is here blah blah
    elseif (isRandom == 2)
        userSelected = input('Input index 0-100 except for 8 43 55:\n');
        if (userSelected = badValues)
            error('Input Error - input index 0-100 except for 8 43 55 )')
        end
        % userselected function is here blahblah
    else
        error('Input Error - enter 1 or 2')
        
    end

Thank you in advance!

Answer 1

[Scott MacKenzie]

This is an example of input validation. Here's one method that achieves what you are after. The prompt is repeated until the user enters a correct value.

while true
    userSelected = input('Input index 0-100 except for 8 43 55: ');
    if (~ismember(userSelected, badValues))        
        break; % input is OK, exit loop and proceed
    end
end

[Akana Juliet]

Thank you so much!