Traps and explanations when comparing non-integer types (floating-point, fixed-point)

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Recently I got a very nice question about comparing non-integer values in Pascal (thank you to Jacek Mulawka!). The core of the question was: Does the condition below (if) evaluate to true or false, and why? MyVar := 0.1; if MyVar = 0.1 then Writeln('Yes, MyVar equals 0.1') else Writeln('No, MyVar does not equal 0.1'); …