data type
A number of data types are built in, including signed and unsigned integers, single and double precision floating point numbers, single and double precision floating point complex numbers, and strings. Additional user-defined types can be defined in programs. These composite types are fixed-size collections of built-in and other user-defined types.

The type suffix, type name, and format of the built-in data types are given in the following table:

SBYTE  Signed byte (8-bits)
@@  UBYTE  Unsigned byte (8-bits)
SSHORT  Signed short (16-bits)
%%  USHORT  Unsigned short (16-bits)
SLONG  Signed long (32-bits)
&&  ULONG  Unsigned long (32-bits)
  XLONG  Natural long (32/64-bits)
  GOADDR  GOTO address (32/64-bits)
  SUBADDR  GOSUB address (32/64-bits)
  FUNCADDR  FUNCTION address (32/64-bits)
$$  GIANT  Signed giant (64-bits)
SINGLE  IEEE Single Precision Floating Point (32-bits)
DOUBLE  IEEE Double Precision Floating Point (64-bits)
STRING  String of unsigned bytes (characters)
  SCOMPLEX  Single Precision Complex (Two SINGLEs)
  DCOMPLEX  Double Precision Complex (Two DOUBLEs)

type suffix
Type suffixes make the data types of variables instantly visible, but are not required. They can be appended to variables and arrays to specify data type when type visibility is important.

simple type
Integer and floating point types are called simple types, because they contain a single element, a number.

Strings are sequences of unsigned bytes normally used to hold characters. Strings are very common in most programs, so special capabilities make string programming faster and more convenient.

composite type
Composite types are collections of simple types, composite types, fixed-size strings, and fixed-size one dimensional arrays of any of these. Two complex number data types, SCOMPLEX and DCOMPLEX , are built in composite types. Additional composite types defined in the prolog of programs, and are called user-defined types.