[pstricks] Testing a number

[John Smith]

Is there a way to test is a number is zero, positive or negative? I tried this using the FP package as follows.
 
\def\test#1{\FPifzero{#1} 0 \else \FPifpos{#1} 1 \else -1 \fi \fi}
 
It works if the number is positive or negative but gives a Tex error about an extra \fi if the input is zero.
 
Thanks.
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