jburkardt

G++_QUADMATH\ G++ Quadruple Real Precision {#g_quadmath-g-quadruple-real-precision align=”center”} ============================

G++_QUADMATH is a C++ program which illustrates the use of quadruple real precision arithmetic with the Gnu G++ compiler for C++.

Every C++ compiler offers a single precision real datatype called float as well as a double precision real data type called double.

Such variables can be declared with statements such as:

float w;\ double x;

On some systems, the G++ compiler provides a real data type stored in 80 bytes, and declared as a __float80, and on some systems, a real data type stored in 128 bytes, declared as a __float128. Variable declarations would be

__float80 y;\ __float128 z;

The Macintosh OSX system I have access to seems to have the __float80 option, but not the __float128 option.

Licensing: {#licensing align=”center”}

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages {#languages align=”center”}

Versions of the QUADMATH examples are available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version.

G++_INTRINSICS, a C++ program which illustrates the use of intrinsic functions provided by the Gnu G++ compiler for C++.

G95_QUADMATH, a FORTRAN90 program which illustrates the use of quadruple precision real arithmetic provided on some systems by the G95 compiler for FORTRAN.

Reference: {#reference align=”center”}

  1. Brian Gough,\ An Introduction to GCC,\ Network Theory Ltd,\ ISBN: 0-9541617-9-3.
  2. Arthur Griffith,\ GCC: The Complete Reference,\ McGrawHill,\ ISBN: 0-07-222405-3.
  3. Richard Stallman,\ Using GCC: The Gnu Compiler Collection Reference,\ Free Software Foundation,\ ISBN: 1-882114-39-6.

Examples and Tests: {#examples-and-tests align=”center”}

You can go up one level to the C++ source codes.

Last revised on 18 April 2011.