Subject: proper use of NULL

(This message is being sent to CPSC 215 Students and TA's)

The defined constant NULL should be used ONLY to initialize
POINTER values.  It should NOT be used to initialize floating
point values or ints as this will produce a nastygram from
gcc:

  double    dis = NULL;

The proper way to initialize a floating point values is:

  double dis = 0.0;

and int should be done

  int  ival = 0;