HP C A.06.05 Reference Manual

HP C/HP-UX Implementation Topics

Data Types

Chapter 10236

Data Types

Data types are implemented in HP C/HP-UX as follows:

• The char type is signed.

• All types can have the register storage class, although it is only honored for scalar types.

Ten register declarations per function are honored.

• The signed integer types are represented internally using twos complement form.

• Structures and unions start and end on an alignment boundary which is that of their most

restrictive member.

• The long long data type cannot be used to declare an array's size.

• The long long data type is available only under -Ac, -Aa +e, and -Ae compilation modes.

Table 10-1 lists the sizes and ranges of different HP C/HP-UX data types.

Table 10-1 HP C/HP-UX Data Types

Type Bits Bytes Low Bound

High

Bound Comments

char 8 1 -128 127 Character

signed char 8 1 -128 127 Signed

integer

unsigned char 8 1 0 255 Unsigned

integer

short 16 2 -32,768 32,767 Signed

integer

unsigned short 16 2 0 65,535 Unsigned

integer

int 32 4 -2,147,483,6

2,147,483,64

Signed

integer

unsigned int 32 4 0 4,294,967,29

Unsigned

integer