Commodore 128D - Prompt Messages

LJ
Now when you RUN the program, the computer
responds with a ? to let you know it is waiting for f j
you to enter what you want the value of K to be. '—*
Type 15 and press RETURN. The computer will
execute the loop 15 times. t j
Prompt You can also make the computer print a mes-
Messages sage in an INPUT statement to tell you what i |
variable it's waiting for. Replace line 10 with:
10 INPUT'PLEASE ENTER A VALUE FOR i
K";K LJ
Remember to enclose the message to be
printed in quotes. This message is called a \ j
prompt. Also, notice that you must use a semi
colon between the ending quote marks of the
prompt and the K. You may put any message {_}
you want in the prompt, but the INPUT state
ment must fit within 160 characters, just as any
BASIC command must. l_j
The INPUT statement can also be used with
string variables. The same rules that apply for \ j
numeric variables apply for strings. Don't forget
to use the $ to identify all your string variables.
Clear your computer's memory by typing j_J
NEW and pressing RETURN. Then type in this
program.
10 INPITTWHAT IS YOUR NAME";N$
20 ? "HELLO ",N$
Now RUN the program. When the computer
prompts "WHAT IS YOUR NAME?", type your
name. Don't forget to press R.ETURN after you
type your name.
Once the value of a variable (numeric or string)
has been inserted into a program through the
use of INPUT, you can refer to it by its variable
name any time in the program. Type ?N$
<RETURN>—your computer remembers your
name.
56 USING C128 MODE—Advanced BASIC Programming