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F sgn(F) (
) 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