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It could simply treat all numbers as floats and consider one of arguments 7.0.

Oleg V. Volkov
– Oleg V. Volkov

2012-07-13 12:26:30 +00:00
Commented Jul 13, 2012 at 12:26
@OlegV.Volkov maybe, however then you only need pick two floating point numbers whose sum has no true representation. Also you could hunt for cancellation errors in subtraction.

Peter Smith
– Peter Smith

2012-07-13 13:35:20 +00:00
Commented Jul 13, 2012 at 13:35

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