MATLAB: While loop with multiple conditional statements not working

conditionalifwhile loop

I created this while loop but when I input a fraction that should terminate the loop it doesn't exit the loop.
Ratio=1;
while (Ratio~=0 || Ratio~=(1/2) || Ratio~=1/3 || ...
        Ratio~=1/5 || Ratio~=1/11 || Ratio~=5/7)
    Ratio=(input('Enter a ratio (parts of milk)/(parts of coffee): '));
    if (Ratio~=0 || Ratio~=1/2 || Ratio~=1/3 || ...
        Ratio~=1/5 || Ratio~=1/11 || Ratio~=5/7)
    disp('Invalid input');
    end
end

Best Answer

Just get rid of that problematic while/input way of doing it and do it like this:
button = menu('Enter the ratio (parts of milk)/(parts of coffee)', '0', '1/2', '1/3', '1/5', '1/11', '5/7')
switch button
  case 1
    ratio = 0;
  case 2
    ratio = 1/2;
  case 3
    ratio = 1/3;
  case 4
    ratio = 1/5;
  case 5
    ratio = 1/11;
  case 6
    ratio = 5/7;
end
fprintf('The user chose ratio = %f\n', ratio);
No while loop is needed because the user is not able to select a disallowed input.
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