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Function std.math.traits.sgn

Returns -1 if x < 0, x if x == 0, 1 if x > 0, and NAN if x==NAN.

F sgn(F) (
  F x
) pure nothrow @nogc @safe
if (isFloatingPoint!F || isIntegral!F);


writeln(sgn(168.1234)); // 1
writeln(sgn(-168.1234)); // -1
writeln(sgn(0.0)); // 0
writeln(sgn(-0.0)); // 0


Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger


Boost License 1.0.