Atari 400

Advanced Atari BASIC 89
In general, it is advisable to keep prompt messages as brief as
possible--as long as the message is clear to the user. Avoid
prompt messages which are overly wordy .
When long prompt messages are being used, it is a good practice
to place the prompt message on one line, and the input response
on the next line. For example, the following statement,
100 PRINT "ENTER OPERATION CODE (1 = ADD; 2 = DEL)"
200 INPUT X
would result in the following display:
ENTER OPERATION CODE (1 = ADD; 2 = DEL)
?
Input Response Checks
A well-designed program should check the user's response to an
Input statement to be certain that no obvious input errors have
been made. If such an error was made, the program should
detect the error and force the user to re-enter the data.
Examples of input errors that can occur are numeric entries that
are
outside of the allowed range, string entries that are longer
than allowed for by the Input statement's variable, and an input