User`s guide

Real and Integer Data Types

Numbers that have a whole number and a fractional part (or mantissa and exponent if the

value is expressed in scientific notation) belong to the data type real. Numeric values having

only a whole number belong to the data type integer. In general, V+ does not require you to

differentiate between these two data types. If an integer is required and you supply a real, V+

promotes the real to an integer by rounding (not truncation). Where real values are required,

V+ considers an integer a special case of a real that does not have a fractional part. The

default real type is a signed, 32-bit IEEE single-precision number. Real values can also be

stored as 64-bit IEEE double-precision numbers if they are specifically typed using the

DOUBLE keyword (for details, see Variable Classes on page 107).

The range of integer values is:

-16,777,216 to 16,777,215

Single-precision real values have 24 bits of precision, and have the approximate range:

-1E+38 to 1E+38

Double-precision real values have 52 bits of precision, and have the approximate range:

-1E+307 to 1E+307

Numeric Representation

Numeric values can be represented in the standard decimal notation or in scientific notation,

as described in the previous section.

Numeric values can also be represented in octal, binary, and hexadecimal form. The following

table shows the required form for each integer representation.

Prefi-

Example

Representatio-

none -193 decimal

^B ^B1001 binary

(maximum of 8

bits)

^ ^346 octal

^H ^H23FF hexadecimal

^D ^D2000000-

double-precision

Integer Value Representation

Real and Integer Data Types

V+Language User's Guide, v17.0

Page 102