Vector Basic Interpreter Basic 80 Reference Manual - page 16
A single precision constant is
any
numeric
constant
that
has:
1•
seven or fewer digits, or
2.
exponential form using E, or
3.
a trailing exclamation point
(1)
A double precision constant is
any
numeric
constant
that
has:
1.
eight or more digits, or
2.
exponential form using 0, or
3.
a trailing number sign
(I)
Examples:
Single Precision constants
46.8
-7.09E-06
3489.0
22.51
345692811
-1.094320-06
3489.0+
7654321.1234
V~iables
are names used to represent values that
are
used
in a BASIC program.
~he value of a variable may be assigned
explicitly by the programmer, or it may be assigned
as
the
result of calculations in the proqram.
Before a variable is
assigned a value, its value is assumed to be zero.
BASIC-80 variable names may be any length, however,
in
the
8K
version,
only the first two characters are significant •
.In the Extended and Disk versions, up to 40
characters
are
significant.
~he characters allowed in a variable name are
letters and numbers, and the decimal
point
is
allowed
in
Extended
and Disk variable names.
The first character must
be a letter.
Special type declaration characters
are
also
allowed -- see below.
A variable name may not be a reserved
word.
The
Extended
and
Disk
versions
allow
embedded reserved words;
the 8K
version does not.
If a
variable
begins
with
FN,
it
is
assumed
to
be a call to a user-defined function.
Reserved
words include all BASIC-80
commands,
statements,
function