Vector Basic Interpreter Basic 80, Reference Manual, Page: 41 / 190

DEF<type> <range(s) of letters>
where <type> is INT, SNG, DBL, or STR
Extended, Disk
To declare variable types as integer, single
precision, double precision, or string.
A OEFtype statement declares that the variable
names beginning with the letter(s) specified
will be that type variable. However, a type
declaration character always takes precedence
over a OEFtype statement in the typing of a
variable.
If no type declaration statements are"
encountered, BASIC-SO assumes
all
variables
without declaration characters are single
precision variables.
10 OEFOBL L-P All variables beginning with
the letters L, M, N,
0,
and P
will be 'double precision
variables.
All variables beginning with
the letter A will be string
variables.
10 DEFINT I-N,W-Z
All variables beginning with
the letters I,
J,
K, L, M,
N, W, X, Y, Z
will
be integer
variables.