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12–4 Simple Programming
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
Using RPN and Equations in Programs
You can calculate in programs the same ways you calculate on the.
keyboard:
Using RPN operations (which work with the stack, as explained in
chapter 2).
Using equations (as explained in chapter 6).
The previous example used a series of RPN operations to calculate the area of
the circle. Instead, you could have used an equation in the program. (An
example follows later in this chapter.) Many programs are a. combination of
RPN and equations, using the strengths of both.
Strengths of RPN Operations Strengths of Equations
Use less memory. Easier to write and read.
Execute a bit faster. Can automatically prompt.
When a program executes a line containing an equation, the equation is
evaluated in the same way that
W
evaluates an equation in the equation
list. For program evaluation, "=" in an equation is essentially treated as "–".
(There's no programmable equivalent to
for an assignment
equation—other than writing the equation as an expression, then using STO
to store the value in a variable.)
For both types of calculations, you can include RPN instructions to control
input, output, and program flow.
Data Input and Output
For programs that need more than one input or return more than one output,
you can decide how you want the program to enter and return information.
For input, you can prompt for a variable with the INPUT instruction, you can
get an equation to prompt for its variables, or you can take values entered in
advance onto the stack.