Hp 32SII Manual do Utilizador descarregar pdf (Página 212)

13–22 Programming Techniques

File name 32sii-Manual-E-0424

Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm

STO(i)

RCL(i)

STO +, –,

, (i)

RCL +, –,

, (i)

XEQ(i)

GTO(i)

X<>(i)

INPUT(i)

VIEW(i)

DSE(i)

ISG (i)

SOLVE(i)

∫

FN d(i)

FN=(i)

Program Control with (i)

Since the contents of i can change each time a program runs–or even in

different parts of the same program — a program instruction such as

!6L5

can branch to a different label at different times. This maintains

flexibility by leaving open (until the program runs) exactly which variable or

program label will be needed. (See the first example below.)

Indirect addressing is very useful for counting and controlling loops. The

variable i serves as an index, holding the address of the variable that

contains the loop–control number for the functions DSE and ISG. (See the

second example below.)

Example:

Choosing Subroutines With (i).

The "Curve Fitting" program in chapter 16 uses indirect addressing to

determine which model to use to compute estimated values for x and y.

(Different subroutines compute x and y for the different models.) Notice that i

is stored and then indirectly addressed in widely separated parts of the

program.

The first four routines (S, L, E, P) of the program specify the curve–fitting model

that will be used and assign a number (1, 2, 3, 4) to each of these models.

This number is then stored during routine Z, the common entry point for all

models:

'

!

Routine Y uses i to call the appropriate subroutine (by model) to calculate the

x– and y–estimates. Line Y03 calls the subroutine to compute y:

&

%1L2

1 2 ... 207 208 209 210 211 212 213 214 215 216 217 ... 375 376

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