$(D_KEYWORD true) if x is a normilized number, $(D_KEYWORD false) otherwise.
assert(!isNormal(0.0f)); assert(!isNormal(float.nan)); assert(!isNormal(float.infinity)); assert(isNormal(0.3f)); assert(!isNormal(5.87747e-38f / 10)); assert(!isNormal(0.0)); assert(!isNormal(double.nan)); assert(!isNormal(double.infinity)); assert(isNormal(1.4)); assert(!isNormal(1.11254e-307 / 10)); assert(!isNormal(0.0L)); assert(!isNormal(real.nan)); assert(!isNormal(real.infinity));
$(D_PSYMBOL isSubnormal).
Determines whether x is a normilized number or not.
Normalized number is a number that can be represented as
<pre> m*2<sup>e</sup> </pre>
where m is the mantissa and e is an exponent that fits into the exponent field of the type F.
0 is neither normalized nor denormalized.