Hp 49g Graphing Calculator Manual do Utilizador descarregar pdf (Página 202)

Example

The following example creates the list of marks used in the previous

example. If a non-numeric value is entered, the program prompts with an

error message. The program performs the following:

® It sets up a loop to collect 20 values.

® It prompts for an input value.

® It tests the input to check if it is a number.

® If the generates an error, the error is trapped, and an error message is

displayed to prompt for a numeric value.

@ Set numeric mode so that error trap works

SF{-3) ;

@ Create an empty list

{}►marks ;

@ Set up a loop for 20 entries.

WHILE SIZE(MARKS)<20 REPEAT

@ Start error-checking routine.

IFERR INPUT("Enter a number","") N

@ Attempt to convert the entry to a number.

@ This generates an error if non-numeric

« OBJ^(N)+l-l -y N

® If no error, append the entry to the list.

« MARKS+N ► MARKS

THEN

MSGBOX("INVALID ENTRY, TRY AGAIN")

END ;

END

Page 10-16

Introduction to programming

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Hp 49g Graphing Calculator Manual do Utilizador Página 202