Number of Unique Operands (NUOprnd)

Description:

This measure is used as an input to the Halstead Software Science metrics. It counts the number of unique operands used in a class.

Example: 

procedure Class1.x(v: boolean);
01 var i,r: Integer;
02    b: Exception;
03 begin
04      if (v) then
05            i := 1
06      else
07            i := 2;
08
09      case i of
10            1:
11            2:
12            else
13      end;
14      try
15            while (v) do begin
16                  v := false;
17                  r := 1;
18                  b := Exception.Create('!!!');
19                  i := ((i * i) + r);
20                  break
21            end
22      except on e: Exception do
23                  raise e
24      end
25 end;

Line N1 n1 N2 n2
04 if if v v
05 = = i, 1 i, 1
07 =   i, 2 2
09 switch switch i  
15 loop loop v  
16 =   v, false false
17 =   1  
18 =, new, call new, call Exception, "!!!" Exception, "!!!"
19 =, *, + *, + i, i, i, r r
23 throw throw e e
Total 14 9 17 9

Where