From a usability point of view, returning a string to indicate nothing found is probably the worst. an empty value or 0 would be much better.
Guillaume, I would say that that depends upon the intended 'audience' for the output.
The Goldbach Conjecture
2 b | ~ 2 b
y equals x divided by 2
multiply by three
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics II - Free Fall
Matlab Basics II - Create a vector with a repeated entry
Matlab Basics - Rounding II
Matlab Basics - Switching Assignments
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