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Programming 21-19
IFERR...THEN...ELSE...END allows a program to intercept
error conditions that otherwise would cause the program
to abort. Its syntax is:
IFERR trap-clause
THEN clause_1
ELSE clause_2
END :
Example
IFERR
60/X
X Y:
THEN
MSGBOX "Error: X is zero.":
ELSE
MSGBOX "Value is "Y:
END:
RUN Runs the named program. If your program name contains
special characters, such as a space, then you must
enclose the file name in double quotes (" ").
RUN "program name": or RUN programname:
STOP Stops the current program.
STOP:
Drawing commands
The drawing commands act on the display. The scale of
the display depends on the current aplet's Xmin, Xmax,
Ymin, and Ymax values. The following examples assume
the HP 40gs default settings with the Function aplet as the
current aplet.
ARC Draws a circular arc, of given radius, whose centre is at
(x,y) The arc is drawn from start_angle_measurement to
end_angle_measurement.
ARC x;y;radius;start_angle_measurement ;
end_angle_measurement:
hp40g+.book Page 19 Friday, December 9, 2005 1:03 AM