The following script calls a function getstr that prompts the user for a string, error-checking until the user enters something (the error would occur if the user just hits the Enter key without any other characters first)

Ch7Ex2.m

thestring = getstr();

fprintf('Thank you, your string is %d characters long\n', ...

 length(thestring))

getstr.m

function outstr = getstr

% Prompts the user until the user enters a string

% with a length > 0

% Format of call: getstring or getstring()

outstr = input('Please enter a string: ', 's');

while isempty(outstr)

 outstr = input('PLEASE enter a string: ', 's');

end

end