Input - Commodore SX-65 Portable User Manual

INPUT
Up to now, everything in a program has been set up before the program
RUNs. Once you executed the program, you couldn't change or add anything.
The INPUT statement lets you send information to a program WHILE it is RUN-
ning. Not only does the program act on this information you supply, but the pro
gram won't continue until you supply it.
To get an idea of how INPUT works, type NEW, press RETURN, and enter this
short program.
10 INPUT A$
20 PRINT "YOU TYPED ";A$
30 PRINT
40 IF AS = "STOP" THEN END
50 GOTO 10
RUN
? GO
YOU TYPED GO
? CONTINUE
YOU TYPED CONTINUE
? STOP
YOU TYPED STOP
Here's what happens in this program:
Line 10 tells the computer to display a question mark to prompt you to INPUT
a value for AS, and to wait until you supply the value before continuing the pro
gram execution.
Line 20 PRINTS a message and the INPUT value, and line 30 PRINTs a blank
line.
Line 40 tells the computer to end the program immediately IF the value you
INPUT for AS is STOP.
Line 50 returns the program to line 10 so you can INPUT another value. IF line
40 is true because the last value you INPUT for A$ was STOP, then line 50 isn't
executed.
You can INPUT numeric or string variables, and you can have the INPUT
statement print a message along with a question mark to describe the kind of
INPUT the computer is waiting for. For example, here's what happens when you
add a prompt message to line 10 of the previous example:
10 INPUT "KEEP GOING";A$ Prompt message can't
RUN be more than 38
KEEP GOING? GO characters
YOU TYPED GO
KEEP GOING? STOP
YOU TYPED STOP
49
INPUT
Up to now, everything in a program has been set up before the program
RUNs. Once you executed the program, you couldn 't change or add anything.
The INPUT statement lets you send information to a program WHILE it is RUN·
ning. Not only does the program act on this information you supply, but the pro·
gram won't continue until you supply
it.
To get an idea of how INPUT works, type NEW, press RETURN , and enter this
short program.
10 INPUT A$
20 PRINT " YOU TYPED ";AS
30 PRINT
40 IF A$
=
"STOP" THEN END
50 GOTO 10
RUN
? GO
YOU TYPED GO
? CONTINUE
YOU TYPED CONTIN UE
? STOP
YOU TYPED STOP
Here's what happens in this program:
Line 10 tells the comp uter to display a question mark to prompt you to INPUT
a value for AS, and to wait until you supply the value before contin uing the pro·
gram execution.
Line 20 PRINTs a message and the INPUT value, and line 30 PRINTs a blank
line.
Line 40 tells the computer to end the program immediately IF the value you
IN PUT for A$ is STOP.
Line 50 returns the program to line 10 so you can INPUT another value. IF line
40 is true becau se the last value you INPUT for AS was STOP, then line 50 isn't
executed.
You can INPUT numeric or string variables, and you can have the INPUT
statement print a message along with a question mark to describe the kind of
INPUT the computer is waiting for. For example, here's what happens when you
add a prompt message to line 10 of the previous example:
10 INPUT " KEEP GOING"; A$
RUN
KEEP GOING? GO
YOU TYPED GO
Prompt message can 't
be more than 38
characters
v
KEEP GOING? STOP
YOU TYPED STOP
v
v
49