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SGN function

Syntax: SGN(numeric-argument)
Discussion: The SGN function returns the sign (positive, negative or zero) of a numeric value according to the following chart: 
  Numeric-argument    Value returned
  ======================================
  positive                 1
  zero                     0
  negative                 1-
The numeric-argument may be a numeric constant, a single-element numeric variable, a numeric array element, a numeric expression, or a numeric function.

The intermediate result of the SGN function is stored in a numeric accumulator with a length and precision of 16.0 If this intermediate result is moved to a receiving numeric variable, its precision is automatically adjusted to the defined precision of that variable.

Example: 
A = SGN(B)
In the above example, the sign of the value stored in the variable B is moved to the variable A. For example, if B equals 25, A will equal 1. Likewise, if B equals -25, A will equal -1, and if B equals 0, A will also equal 0.