Chapter 4. Basic Program Elements
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4.3 Labels
A label can contain the following characters:
• Alphabet characters
• Numeral characters
• Period (.)
■
Rules for naming labels
• The label length should be limited to 10 characters including periods.
• A program can contain up to 9999 labels.
• Label names make no distinction between uppercase and lowercase letters.
The following labels, for example, will be treated as the same label.
filewrite
FILEWRITE
FileWrite
• No asterisk (*) or dollar sign ($) should be used for a label. The following label examples
are invalid:
*Label0
Label1$
• A label made up of only numeral letters as shown below is valid.
1000
1230
Note that a single 0 (zero) should not be used as a label name since it has a special
meaning in
ON ERROR GOTO, ON KEY...GOSUB, and RESUME statements.
• A reserved word cannot be used by itself for a label name, but can be included within a
label name as shown below.
inputkey
• A label should not start with the character string FN.
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