Some things to be noted while writing picbasic programs

Identifiers
Identifiers are names used for line labels and symbols.
An identifier may be any sequence of letters ,digits,and
underscores,but it must not start with a digit.
Identifiers may be any number of characters in length :
however,the compiler will recognize only first 32
characters .Identifiers are not case sensitive hence
the labels LOOP:loop:Loop,etc will be read equivalently.
Line labels:
Labels are anchor points in our program.They are identifiers
followed by a colon.
Symbols
Symbols make our program more readable.They use identifiers
to represent the constants,variables or other quantities.
Symbols cannot be used for line labels
Example:
symbol five = 5 'symbolic constant
symbol number = W2 'named word variable