Line Label (program)
The Line label is an optional name for a program line. They are accepted at the beginning of all statements following the line number. The label may be from one to 30 alphabetic, numeric or underscore characters in length, but must begin with a letter. Each line label must be unique and immediately followed by a colon. Business Rules allows most statement and command keywords to be used as line labels. In the following statement, "LABEL_SAMPLE:" is a line label:
00900 LABEL_SAMPLE: Rinput #1, Select '2,40,Cr 10,[w]',Attr "[A]": Autoselect$
A line label can then subsequently be used in place of a line number to reference the line from a secondary expression. In the following example, the line label BIG is defined to represent line 120; it is then used as a line reference for the GOTO statement in line 300. (F1 is also a line label):
00120 BIG: Print Using F1: A$,T(5) o o o 00300 GOTO BIG
Line labels are often used to easily refer to form statements:
1100 read #10,using Addressform: Mat Co$,City$,St$,Zc$,Mat Dd$ 1110 Addressform: form 3*C 30,C 20,C 2,C 12,Pos 257,10*C 18
For information about the labels that are used in procedures, see Line Label (procedure).