I would like to modify FB^3's trig functions to work with degrees 
automatically, rather than radian measurements for angles. I think 
OVERRIDE is the way to go but have not found a workable routine yet.

Any help with this small sample for the sine function would be 
appreciated. It's a start, to be compiled in CONSOLE mode and for 
cpuPPC.  I need help with the OVERRIDE section which doesn't seem to 
have any effect.

    OVERRIDE RUNTIME SIN( degrees AS DOUBLE )
      DIM AS DOUBLE radians, result
      LET radians = degrees / 180.0 * PI
      LET result = SIN( radians )
    END FN = result

    DIM AS DOUBLE  sineValue, angle
    DIM h,v                    ' horz & vert position of plotted points

    PLOT 400,400               ' force size of graphics window
    PLOT 0,200 TO 400,200      ' draw horz. axis
    PEN 2,2
    COLOR _zRed

    FOR angle = 0 TO 360 STEP 15
      LET sineValue = SIN( angle )
      PRINT USING "###  "; angle ;
      PRINT USING "##.### ###"; sineValue
      LET h = angle
      LET v = 200 - sineValue * 100
      CIRCLE h,v, 2             ' show a small point (or PLOT h,v )
    NEXT angle

Ideally, this would print a table of every 15 degrees and their sine 
values as well as plot a set of red points for the function. 
Unfortunately, the result is the same as without my attempt to 
override the SIN routine.

I did not find a definition for function SIN( x AS DOUBLE ) in the 
headers, just for RUNTIME "_SIN" which had assembler code in it.

BTW - I'd like to do this for use by students in high school that are 
learning some programming ideas and investigating 
geometry/trigonometry but without any knowledge of radians - just 
degrees. Once I learn how to override the routines, the new versions 
can be placed in an INCLUDE file so the students don't see the inner 
workings. Plan B would be to create an alternate set of functions 
with similar names, for example FN SINE( x ) but then the 'FN' syntax 
and names would not be the same as that used in their texts.

Ideally, I'd really like to see a global variable or constant in FB 
that would indicate whether trig uses degrees or radians, like many 
calculators do. (ex.  gFBtrigOption = _fbUseDegrees or gFBtrigOption 
= _fbUseRadians)  But that's another story for the future.

Thanks in advance for any help.

- Stu Cram
   Regina, Sask.   CANADA