Are These All The Integer Types In C Post: 303003781

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Top Forums Programming Are These All The Integer Types In C Post 303003781 by Corona688 on Wednesday 20th of September 2017 11:53:35 AM

09-20-2017

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The only parts you didn't mention are signed vs unsigned, pointers, and bitfields. Pointers on most modern systems are all the same size, related to the system's address size, i.e. 32-bit on 32 bit systems, 64-bit on 64.

Note that "long long" and "long double" are nonstandard types, unavailable on many systems. "long long" particularly is no longer needed to get a 64-bit type, 'long' has become natively 64-bit on modern 64-bit computers (except on Windows for some reason).

Also, the exact number of bits in 'char', 'short', 'int', and 'long' are not rigidly defined by the language, they're a fact of the processor you use it with, though even there they're sometimes interpreted differently from publisher to publisher. There was a compiler for a strange Cray supercomputer which had no types smaller than 64 bits!

Bitfields are a rarely-used feature which can make an integer of an arbitrary number of bits (probably up to the system word size.) int y:4; Voila, a 4-bit integer which can represent values from -8 to +7. This feature is mostly avoided as it's slow and wasteful of space. I've only seen it used exactly once -- to make ersatz 32-bit integers for that strange Cray supercomputer.

Last edited by Corona688; 09-20-2017 at 01:04 PM..

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values

values.h(3HEAD)                                                       Headers                                                      values.h(3HEAD)

NAME

       values.h, values - machine-dependent values

SYNOPSIS

       #include <values.h>

DESCRIPTION

       This file contains a set of manifest constants, conditionally defined for particular processor architectures.

       The  model  assumed  for  integers  is binary representation (one's or two's complement), where the sign is represented by the value of the
       high-order bit.

       BITS(type)                      The number of bits in a specified type (for example, int).

       HIBITS                          The value of a short integer with only the high-order bit set.

       HIBITL                          The value of a long integer with only the high-order bit set.

       HIBITI                          The value of a regular integer with only the high-order bit set.

       MAXSHORT                        The maximum value of a signed short integer.

       MAXLONG                         The maximum value of a signed long integer.

       MAXINT                          The maximum value of a signed regular integer.

       MAXFLOAT, LN_MAXFLOAT           The maximum value of a single-precision floating-point number, and its natural logarithm.

       MAXDOUBLE, LN_MAXDOUBLE         The maximum value of a double-precision floating-point number, and its natural logarithm.

       MINFLOAT, LN_MINFLOAT           The minimum positive value of a single-precision floating-point number, and its natural logarithm.

       MINDOUBLE, LN_MINDOUBLE         The minimum positive value of a double-precision floating-point number, and its natural logarithm.

       FSIGNIF                         The number of significant bits in the mantissa of a single-precision floating-point number.

       DSIGNIF                         The number of significant bits in the mantissa of a double-precision floating-point number.

SEE ALSO

       intro(3) math.h(3HEAD)

SunOS 5.10                                                          2 Mar 1993                                                     values.h(3HEAD)