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18-20 Programmeren
IFERR...
THEN...
ELSE…
END...
Veel condities worden automatisch door de HP 39gs
herkend als foutcondities en worden automatisch
behandeld als fouten in programma’s.
IFERR...THEN...ELSE…END stelt een programma in staat
om foutcondities te onderscheppen die het programma
anders zouden afbreken. De syntaxis is als volgt:
IFERR trap-clausule
THEN clausule_1
ELSE clausule_2
END
Voorbeeld
IFERR
60/X
X Y:
THEN
MSGBOX "Fout: X is nul.":
ELSE
MSGBOX "Waarde is "Y:
END:
RUN Voert het genoemde programma uit. Als uw
programmanaam speciale tekens bevat, zoals een
spatie, dan moet u de bestandsnaam insluiten tussen
dubbele aanhalingstekens (" ").
RUN "programma naam": of RUN programname:
STOP Stopt het huidige programma.
STOP:
Tekenopdrachten
De tekenopdrachten werken op het beeldscherm. De
schaal van het scherm is afhankelijk van de huidige Xmin-
, Xmax-, Ymin- en Ymax-waarden van het aplet. De
volgende voorbeelden veronderstellen de
standaardinstellingen van de hp 39gs met het Functie-
aplet als het huidige aplet.
ARC Tekent een cirkelboog met een gegeven straal, waarvan
het midden op (x,y) ligt. De boog wordt getekend van
begin_hoek_meting tot einde_hoek_meting.
ARC x;y;straal;begin_hoek_meting ;
einde_hoek_meting:
HP 39gs Dutch.book Page 20 Thursday, December 8, 2005 11:59 PM
262


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