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How do I use a while loop to keep asking for input of even numbers?

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adena0
adena0 2019-1-18
编辑： adena0 2019-1-18
How do I aks user to input an even number but if the number is odd or equal to 0, it should keep asking for input?

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KSSV
KSSV 2019-1-18
prompt = 'Enter a number:';
S = input(prompt) ;
if mod(S,2)
S = input(prompt) ;
end
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adena0
adena0 2019-1-18
编辑：adena0 2019-1-18
thanks but, this was my code originally and it failed after enteriing and odd number twice. i think a while loop needs to be used i just don't know how

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