Creating a password checker using a function

So im trying to create a password checker that checks for: length of at least 8 characters 1 upper case and 1 lower case but im stuck. This is what i have so far but none of it is working

if true
  % code
function [len] = isValidPasswordFUNC(password)
% A function that checks a password to be valid
% Checking the length of the password
len = length(password)
if len < 8
  disp('Invalid password is too short');
else
  disp('Password is Valid length');
end

Then the script:

if true
  % code
close all
clear
clc
password = input('Enter your password: ');
function [len] = isValidPasswordFUNC(password);
end

Thanks any help or a point in a direction is very helpful thanks

Answer 1

[Guillaume]

Sounds like homework, so I won't give you the solution. I'll just tell you to have a look at isstrprop.

Also, should your checking function return the length of the password or an indication of whether or not the password is valid? The latter would make more sense to me.

[Jacob Kiem]

I have this so far but it only works up to checking the upper case letters. I have also tried to make it a function but not working or displaying anything.

if true
  % code
close all
clear
clc
password = input('What is your password: ','s');
L = strlength(password);
if L < 8
  disp('Invalid amount of characters')
else 
  disp('Valid amount of characters')
end
TU = isstrprop(password,'upper');
if TU >= 1
  disp('Valid amount of upper case characters');
else 
  disp('Invalid amount of upper case characters');
end
TL = isstrprop(password,'lower')
if TL >= 1
  disp('Valid amount of lower case characters');
else 
  disp('Invalid amount of lower case characters');
end
TN = isstrprop(password, 'digit');
if TN >= 1
  disp('Valid amount of numerical characters');
else
  disp('Invalid amount of numerical characters');
end

end