Hp 48g Graphing Calculator Manual do Utilizador descarregar pdf (Página 409)

100

101

Examples of Program Actions

Program

Results

■i: 1 2 :i-

"Hello" i fl B

2: "Hello"

1 « H P>

■s ’1+2’ :i-

U 'l+

‘

■s ’1+2’ +HUM :*■

12 3

« s

+ :+ :«■

is «

+ :«•

« « 1 2 + s- EvFlL :*•

1 - 3

Actually, programs can contain more than just objects—they can also

contain struciures. A structure is a program segment with a defined

organization. Two basic kinds of structures are available:

■ Local variable structure. The ^ command defines local variable

names and a corresponding algebraic or program object that’s

evaluated using those variables.

B Branching structures. Structure words (like DO...UNTIL...END)

define conditional or loop structures to control the order of

execution within a program.

A local variable structure has one of the following organizations inside

a program;

■ K -s- nainei ... name^ 'algebraic' :*■

■ i: -i- name I ... name^ « program :s- :*■

The command removes n objects from the stack and stores them

in the named local variables. The algebraic or program object in

the structure is automatically evaluated because it’s an element of

the structure—even though algebraic and program objects are put

on the stack in other situations. Each time a local variable name

appears in the algebraic or program object, the variable’s contents are

substituted.

Programming the HP 48 29-3

1 2 ... 404 405 406 407 408 409 410 411 412 413 414 ... 611 612

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