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GeoBASIC User Manual 8 — Typical GeoBASIC Programming
8-10 TPS1100-Version 2.10
The base name succinctly describes the object. For example, PointNumber or
just
PointNo
for the number of a point. Object tags are short abbreviations and
simplifications describing the type of the object. For example, the tag '
i
' in
iPointNo
denotes that the type of the variable is
Integer
. The following table
lists the tags for the GeoBASIC types.
type tag
Integer i
Logical l
Double d
Distance d
Subdistance d
Angle d
Pressure d
Temperature d
String s
Note that all types which represent floating point numbers are tagged by '
d
'. This is
because operations valid for the type
Double
are also valid for the other
d
–
tagged types.
If there are several similar object names, a qualifier may follow the name and
further clarify it. For example if we kept two special point numbers, one for the
first point and one for the last, the variable names would be the (qualified)
variables
iPointNoFirst
and
iPointNoLast
.
Structure types do not have a default prefix, if needed the (abbreviated) type name
could be used. For arrays the base name itself could contain the information that
the variable names an array.
For global variables an additional prefix '
g
' might be useful.
8.3.2 Constants and user-defined types
Constants begin with an upper case character. If constants contain only upper case
characters (as most of the predefined constants do) the underscore '_' is used to
separate parts of the name. Often constants can be grouped together, then a prefix
is used to denote their common criterion. For example the return codes use RC, as
in
RC_OK, RC_ABORT
, etc.