HP 39GS hp 39gs_user's guide_English_E_HDPMG39AE13.pdf - Page 241

RUN STOP 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 Y: THEN MSGBOX "Error: X is zero.": ELSE MSGBOX "Value is "Y: END: 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: 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 39gs 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 : Programming 18-19