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D. Comparatives

If`x` or`y` is a floating-point or complex number, the comparison`x=y` is treated like the everyday use of equality (that is, with a reasonable relative tolerance), yielding`1` if the difference`x-y` falls relatively close to zero. Tolerant comparison also applies to other relations and to floor and ceiling (`<.` and`>.`); a precise definition is given in Part III under Equal (`=`). An arbitrary tolerance`t` can be specified by using the fit conjunction (`!.`), as in`x =!.t y` .`` The global tolerance can be queried and set using`9!:18` and`9!:19` .

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