Apple IIe - Manual (Page 38)

Page 38 of 74 IIe
Printed: Tuesday, March 4, 2003 10:40:15 AM
80 INPUT N2$ Displays ? on the screen. Whatever name you type is
stored in variable N2$.
90 PRINT Prints a blank line.
100 PRINT THE C1$; ROBOT 110 PRINT WITH THE C2$; EYES 120 PRINT
GRABBED N1$; WHILE 130 PRINT N2$; RAN FOR HELP.
Prints what's inside the quotation marks
interspersed with the colors and names you assigned
to the variables.
140 END Signals the end of the program.
After you type RUN, your display will look something like this:
COLOR? GREEN ANOTHER COLOR? PURPLE NAME? ROY ANOTHER NAME? HEATHER
THE GREEN ROBOT WITH THE PURPLE EYES GRABBED ROY WHILE HEATHER RAN FOR HELP.
You can use this same program to create your own sentences. In fact, you may want to write a
program that creates a whole story.
Important!
When you choose variable names, be sure that you don't choose a word that is an Applesoft BASIC
reserved word.
Not even part of a variable can be a reserved word. For example, a variable
can't be named LETTER because the reserved word LET is part of the name.
Reserved words are listed earlier in this chapter.
And don't forget the two-character rule: Applesoft BASIC looks at only the first two
characters of a variable name. If in the Crazy Sentence program the variables were named
NAME1$ and NAME2$, Applesoft BASIC would have created only one variable.
Printing Your Programs on Paper
If you have a printer connected to your computer, you can print a copy of your program on paper
using the LIST command.
This is useful in debugging programs.
Here's how:
Turn on your printer.
Type PR#1 to direct all information to your printer.
Type LIST
Type PR#0 to send information back to the screen instead of to the printer.
PR What?
PR#1 is shorthand for print to the device attached to slot 1.
You've Only Begun to Program
Now that you've made your way through this chapter, you know enough to write a few simple BASIC
programs.
To go further with Applesoft BASIC, ask your Apple dealer for the Applesoft
Tutorial. It's a gentle introduction to BASIC that shows you how to write programs that
produce animated color graphics, in addition to programs like the ones in this chapter that
manipulate words and numbers.
From there, you can graduate to the Applesoft BASIC Programmer's
Reference Manual, a two-volume set that is the BASIC programmer's primary source of information
on the Applesoft BASIC programming language.