On , Miguel Angel Scapolla (4:90/90@fidonet) wrote: 
 > Or implement this function via macro definition:
 > #define SIGN(x) (((x) > 0) ? 1 : (((x) < 0) ? -1 : 0))
 > And use this:
 > int z = SIGN (y);
Miguel...
  As previously noted, this is an usafe macro. Consider what happens when you 
do somtehing like...
      int z = SIGN(y++);
...Some of the time, y will be incremented once, sometimes twice. 
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