[Tutor] bubble sort function

Sunil Tech sunil.techspk at gmail.com
Wed Nov 26 14:55:10 CET 2014

Thank you Alan for explanation

That's what the bit inside the loop does.
> It checks whether the input string is a digit (specifically a decimal
> digit).
> If it is a digit it returns the result as an integer
> otherwise it spits out an error and goes round the loop again.
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