how do i verify input is only zeros and 1's

i am trying to figure out how to check if a number entered by a user is only zeros and ones (checking if its binary). I am not allowed to use a table or matrix

this is what I have, but doesn't seem to work

number = input('please enter a number:', 's')

if all(ismember(number,['0' '1'])) fprintf('this is a binary number.'); else fprintf('this is not a binary number.'); end

Answer 1

[Guillaume]

"It does not seem to work" In what way?

>>number = '1100111';
>>all(ismember(number, '01'))
ans = 
    1

>>number = '123'
>>all(ismember(number, '01'))
ans =
    0

Star is right that ['0' '1'] is the same as '01', but if you want to ensure that the characters entered are only '0' or '1', your if statement is correct.

My guess is that it "does not work" because you also put some spaces in your string, eg. '0 1 0 1 1 0'. If you want t allow this format:

all(ismember(number, '01 '))

[rick o'brien]

thank you very much guys for your help i've been trying to figure this out all night. the format all(ismember(number, '01')) solved the problem