I think this is closest to the OP's intent, because it also detects if the number doesn't fit into an "integer".

But I'd change the if condition to 
... if $input eq int $input;

[download]
because for humans that's easier to parse than 
... if int $input eq $input;

[download]

In reply to Re^2: using int and the range function by soonix
in thread using int and the range function by Melderon

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