MATLAB: How to make a while loop that will return to a statement unless a condition is met

while loop

I am trying to make a while loop that will goes on forever unless a condition is met, in this case I want the loop to keep repeating unless I enter the word imperial or metric. And when I enter other words it will continue ask the question "Please make a choice", the code i have here just opts out whenever i enter other words
clear,clc
x = [];
while isempty(x)
    x = input('Please make a choice (imperial or metric) - ','s');
    if strcmp(x,'imperial')
        disp('yes')
    if strcmp(x,'metric')
            disp('no')
    end
    end

Best Answer

If strcmp()
  ...
elseif strcmp()
  ...
else
 Give message
 x = '' 
end
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