Indicates whether a numeric value is positive, negative, or zero.
function Sign(const AValue: Integer): TValueSign; overload; function Sign(const AValue: Int64): TValueSign; overload; function Sign(const AValue: Double): TValueSign; overload;
TValueSign Sign(const int AValue); TValueSign Sign(const Int64 AValue); TValueSign Sign(const Double AValue);
Use Sign to test the sign of a numeric value. Sign returns
0 if AValue is zero.
1 if AValue is greater than zero.
-1 if AValue is less than zero.
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