How to request user input to press Esc or Enter ?

How to request user input to press Esc or Enter ?

% this is a pseudo-code I wrote just to give an idea about what I am trying to achieve:

answer = input('Please enter Esc to exit this code or Enter to continue:');
keepRunning = true;
while (keepRunning)
    if (answer ~= Esc && answer ~= Enter)  % If the user does not input either Esc or Enter
        answer = input('ERROR. Please enter Esc to exit this code or Enter to continue:'); 
    elseif (answer == Esc) % Exit this code
        disp('exit the code')
        keepRunning = false;
        return
    elseif (answer == Enter) % Continue this code and do stuff
        disp('continue to run this code')
        keepRunning = false;
        continue % or do stuff here
    end
end

Answer 1

[Jan]

This will not work. The input command is not sufficient to catch a pressed Esc key.

Using the input capabilities of the command window to interprete key clicks is a bad choice in general. Use a figure instead, which is nicer and allows to analyse the pressed keys using the WindowKeyPressFcn and even the WindowKeyReleaseFcn.

The command window is not powerful enough to solve such genereal purpose GUI jobs. You can do it using the undocumented Java interface, but this is fragile.

[Sim]

Great answer @Jan!! Thanks for showing the possible ways to take :-)