%-------------------------------------%
% Homework 6: Problem 2               %
% Date: 10/22/2002                    %
%                                     %
% Gun Srijuntongsiri                  %
% gs61                                %
% ??????                              %
%-------------------------------------%

% Variables
% ---------
%   numMultFive = number of multiples of 5 encountered so far.
%   curNum      = last inputted number.

numMultFive = 0;    % Initialize to zero

% Ask for the number in the sequence
curNum = input('Enter a number (non-positive int = quit): ');

% Continue doing if the number is positive
while curNum > 0
    % if it's multiple of five
    if mod(curNum,5)==0
        numMultFive = numMultFive+1;  % increase count of multiples of five.
    end

    % Ask for next number
    curNum = input('Enter a number (non-positive int = quit): ');
end

% Display output
disp(['The number of multiples of five is ', num2str(numMultFive),'.']);


% Other useful test cases are when
%   1. the first number is non-positive, 
%   2. the entire sequence doesn't have any multiple of fives.
%   3. the ending number (i.e. the non-positive number) is a multiple of five.
%
% Limitations are (1) not clear what to do if user enter a positive non-integer,
% (2) when user enter the same number more than once, and if that number is
% a multiple of five, say 5,5,5,5,-1, then it's not clear whether to say
% the number of multiples of five is 4 or 1.