MATLAB Project Code (Random Password Generator) -- 2

I NEED HELP ASAP. Please find any errors in the code, let me know if there should be anything removed or added specifically. If something needs to be added please specify the exact code needed. I am looking for ways I can make this code better or analyze what I can remove. CODE: rand('twister', sum(100*clock)); %{ Define data sets %} % Edit these sets as needed up = ['A' 'B' 'C' 'D' 'E' 'F' 'G' 'H' 'I' 'J' 'K' 'L' 'M'... 'N' 'O' 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W' 'X' 'Y' 'Z']; low = ['a' 'b' 'c' 'd' 'e' 'f' 'g' 'h' 'i' 'j' 'k' 'l' 'm'... 'n' 'o' 'p' 'q' 'r' 's' 't' 'u' 'v' 'w' 'x' 'y' 'z']; nums = ['0' '1' '2' '3' '4' '5' '6' '7' '8' '9']; special = ['!' '@' '#' '$' '%' '^' '&' '*' '_' '-' '+' '=' '' ':' ';' '.' ',']; %{ Prompt for minimum password length %} minimum = input('Please enter the minimum password length: '); %{ Prompt for maximum password length %} maximum = -1; while (maximum < minimum) maximum = input('Please enter the maximum password length: '); end %{ Calculate password length %} pass_length = ceil((maximum - minimum + 1) * rand) + minimum - 1; fprintf('\nThe password length will be %d characters long.\n\n', pass_length); %{ Prompt for minimum number of uppercase letters %} requirement(1) = inf; while (requirement(1) > pass_length) requirement(1) = input('Please enter the minimum number of uppercase characters: '); end req1 = requirement(1); %{ Prompt for minimum number of lowercase letters %} requirement(2) = inf; while (requirement(2) > (pass_length - requirement(1))) requirement(2) = input('Please enter the minimum number of lowercase characters: '); end req2 = requirement(2); %{ Prompt for minimum number of numbers %} requirement(3) = inf; while (requirement(3) > (pass_length - requirement(1) - requirement(2))) requirement(3) = input('Please enter the minimum number of numerical characters: '); end req3 = requirement(3); %{ Prompt for minimum number of special characters %} requirement(4) = inf; while (requirement(4) > (pass_length - requirement(1) - requirement(2) - requirement(3))) requirement(4) = input('Please enter the minimum number of special characters : '); end req4 = requirement(4); %{ Compute password %} % character counter i = 1; password = ''; up_count = 0; low_count = 0; nums_count = 0; special_count = 0; while i <= pass_length % produce a random number from 1 to 4 select = ceil((4) * rand); if (requirement(select) > 0) || ((pass_length - i + 1 - requirement(1) - requirement(2) - requirement(3) - requirement(4)) > 0) switch select % uppercase case 1 password(i) = up(ceil((length(up)) * rand)); up_count = up_count + 1; % lowercase case 2 password(i) = low(ceil((length(low)) * rand)); low_count = low_count + 1; % number case 3 password(i) = nums(ceil((length(nums)) * rand)); nums_count = nums_count + 1; % special character case 4 password(i) = special(ceil((length(special)) * rand)); special_count = special_count + 1; end i = i + 1; % if it satisfies a requirement decrement if (requirement(select) > 0) requirement(select) = requirement(select) - 1; end end end %{ Display results %} if (req1 <= up_count) && (req2 <= low_count) && (req3 <= nums_count) && (req4 <= special_count) fprintf('\nAll requirements satisfied!\n'); fprintf(' - %d uppercase characters\n', up_count); fprintf(' - %d lowercase characters\n', low_count); fprintf(' - %d numerical characters\n', nums_count); fprintf(' - %d special characters\n\n', special_count); fprintf('The password is: %s\n\n', password); else disp('One or more requirements were not satisfied!'); end