checking input from user

2015 10 27
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更新时间：2015 10 29
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How to check the value entered by the user is a valid integer.For example: 2, 3,10 etc and not invalid value such as negative value(example:-3, -7, -10) or decimal value(example:0.14,3,1,-7,2,-0.4) or a character/special symbol (example: a, @,&, hi)

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Chad Greene
Chad Greene 2015-10-27

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To see if x is an integer greater than or equal to zero,
all([mod(x,1)==0 x>=0])

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pavikirthi
pavikirthi 2015-10-27
Thanks,but I think its not working when the user inputs character like a, m, i etc, how to check for that?
Chad Greene
Chad Greene 2015-10-27
Ah, yes, I missed that part.
all([mod(x,1)==0 x>=0 isnumeric(x)])
pavikirthi
pavikirthi 2015-10-29
Thank you

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