Hp 39g Graphing Calculator Manual do Utilizador descarregar pdf (Página 230)

REPLACE

SUB

ZEROGROB

Replaces portion of graphic in graphicnamel with

graphicnamel, starting at position . REPLACE also works

for lists and matrices.

REPLACE graphicnamel; (position); graphicnamel:

Extracts a portion of the named graphic (or list or matrix), and

stores it in a new variable, name. The portion is specified by

position and positions.

SUB name; graphicname; (position); (positions):

Creates a blank graphic with given width and height, and

stores it in graphicname.

ZEROGROB graphicname; width; height:

Loop commands

DO...UNTIL

...END

WHILE...

REPEAT...

END

Loop structures allow a program to execute a routine

repeatedly. The HP 39G/40G has three loop structures. The

example programs below illustrate each of these structures

incrementing the variable A from 1 to 12.

Do ...Until... End isaloop structure that executes the/oop-

claiise repeatedly until test-clause returns a true (nonzero)

result. Because the test is executed after the loop-clause, the

loop-clause is always executed at least once. Its syntax is:

DO loop-clause UNTIL test-clause END

1 ► A:

DO A + 1 ► A

UNTIL A == 12

END

While ... Repeat... End is a loop structure that repeatedly

evaluates test-clause and executes loop-clause sequence if the

test is true. Because the test-clause is executed before the

loop-clause, the loop-clause is not executed if the test is

initially false. Its syntax is:

WHILE test-clause REPEAT loop-clause END

1 ► A:

WHILE A < 12

REPEAT A+1 ► A

END

15-22

Programming

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