National Instruments PC-OPDIO-16 Manuale Utente

Table 6-2 shows the primary type names and their ranges.

Table 6-2.  Primary Type Names

I16

16-bit signed
integer

-32,768 to 32,767

short

Integer (for example:

deviceNum%

)

Integer

U16

16-bit unsigned
integer

0 to 65,535

unsigned
short

Not supported by
BASIC.  For functions
that require unsigned
integers, use the signed
integer type instead.
See the I16 description.

Word

I32

32-bit signed
integer

-2,147,483,648 to
2,147,483,647

long

Long integer (for
example: 

count&

)

Longint

U32

32-bit unsigned
integer

0 to 4,294,967,295

unsigned
long

Not supported by
BASIC.  For functions
that require unsigned
long integers, use the
signed long integer type
instead.  See the I32
description.

Not supported
by Pascal.  For
functions that
require
unsigned long
integers, use
the signed long
integer type
instead.  See
the I32
description.

F32

32-bit single-
precision
floating point

-3.402823 x 10

38

 to

3.402823 x 10

38

float

Single-precision floating
point (for example:

num!

)

Single

F64

64-bit double-
precision
floating point

-1.797683134862315 x
10

308

 to

1.797683134862315 x
10

308

double

Double-precision
floating point (for
example: 

voltage#

)

Double

Apart from the data type differences, there are a few language-dependent considerations you
need to be aware of when you use the NI-DAQ API.  Please read the following sections that
apply to your programming language.