C/C++ Programmer's Guide (G06.25+)

C and C++ Extensions

HP C/C++ Programmer’s Guide for NonStop Systems—429301-008

2-21

Data Types

decimal

The data type decimal is an HP extension. decimal is applicable only for the native

C and TNS C languages, which use the pragma SQL.

decimal specifies the predefined decimal type, which is used to access data in an

SQL database. If you use decimal, you must specify the SQL pragma. If you want

functions to manipulate decimal variables, you must specify the SQL pragma and

include the header sqlh. For information regarding the use of the data type decimal,

refer to the NonStop SQL/MP Programming Manual for C.

long long

The data type long long is a 64-bit integer. long long is an HP extension. long

long is applicable for the native and TNS C and C++ languages.

For TNS C++, type matching occurs for initialization, expressions, and argument lists.

Variables of type long long are allowed in all contexts that TNS C allows them.

Constants of type long long are recognized when the decimal number is followed by

the modifier LL or ll. Variables and constants of type long long are allowed in

classes and templates.

unsigned long long

The data type unsigned long long is an unsigned 64-bit integer. unsigned long

long is an HP extension. unsigned long long is applicable only for the TNS/E

native C and C++ languages.

signed char

The data type signed char is an HP extension to Cfront, the TNS C++ preprocessor.

The data type signed char can be used to distinguish a specific instance of an

overloaded member function.

Size of Type int

For native C and C++, the data type int is always 32 bits.

For TNS OSS programs, the data type int is always 32 bits. For TNS Guardian

programs, the size of the data type int can be 16 bits or 32 bits, depending on

whether you have specified the 32-bit (wid) data model. To specify the 32-bit (wide)

double double

long double

* The bool type became available at the D45 release with native C++ using the

VERSION2 directive.

Table 2-4. Predefined Data Types (page 2 of 2)

Long forms Abbreviated forms