3.2.46. SIGN(number)

Returns either -1, 0 or 1, depending on whether number is
negative, zero, or positive, respectively. Number must be a valid
REXX number, and are normalized according to the current settings
of NUMERIC before comparison.

     SIGN(-12)      –>   ‘-1’
     SIGN(42)       –>   ‘1’
     SIGN(-0.00000012)   –>   ‘-1’
     SIGN(0.000)         –>   ‘0’
     SIGN(-0.0)          –>   ‘0’


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