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Data types are implemented in HP C/HP-UX as follows: 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 “HP C/HP-UX Data Types ” 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 | -2,147,483,648 | 2,147,483,647 | Signed integer | unsigned int | 32 | 4 | 0 | 4,294,967,295 | Unsigned integer | long (ILP32) | 32 | 4 | -2,147,483,648 | 2,147,483,647 | Signed integer | long (LP64) | 64 | 8 | -263 | 263 -1 | Signed integer | long long | 64 | 8 | -263 | 263 -1 | Signed integer | unsigned long (ILP32) | 32 | 4 | 0 | 4,294,967,295 | Unsigned integer | unsigned long (LP64) | 64 | 8 | 0 | 264 -1 | Unsigned integer | unsigned long long | 64 | 8 | 0 | 264 -1 | Unsigned integer | float | 32 | 4 | See (a) below. | See (b) below. | Floating-point | double | 64 | 8 | See (c) below. | See (d) below. | Floating-point | long double | 128 | 16 | See (e) below. | See (f) below. | Floating-point | enum | 32 | 4 | -2,147,483,648 | 2,147,483,647 | Signed integer |
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In the following comments, the low bounds of float, double, and long double data types are given in their normalized and denormalized forms. Normalized and denormalized refer to the way
data is stored. Normalized numbers are represented with a greater
degree of accuracy than denormalized numbers. Denormalized numbers
are very small numbers represented with fewer significant bits than
normalized numbers. - a.
Least normalized: 1.17549435E-38F
Least
denormalized: 1.4012985E-45F - b.
3.40282347E+38F - c.
Least normalized: 2.2250738585072014E-308
Least denormalized:
4.9406564584124654E-324 - d.
1.7976931348623157E+308 - e.
Least normalized: 3.3621031431120935062626778173217526026E-4932L
Least denormalized:
6.4751751194380251109244389582276465525E-4966L - e.
1.1897314953572317650857593266280070162E+4932L
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