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<html>
<head>
<title>
I8LIB - A Double Precision Integer Arithmetic Utility Library
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
I8LIB <br> A Double Precision Integer Arithmetic Utility Library
</h1>
<hr>
<p>
<b>I8LIB</b>
is a FORTRAN90 library which
contains a number of utility routines for "I8" or "double precision integer"
arithmetic.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>I8LIB</b> is available in
<a href = "../../c_src/i8lib/i8lib.html">a C version</a> and
<a href = "../../cpp_src/i8lib/i8lib.html">a C++ version</a> and
<a href = "../../f77_src/i8lib/i8lib.html">a FORTRAN77 version</a> and
<a href = "../../f_src/i8lib/i8lib.html">a FORTRAN90 version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/c4lib/c4lib.html">
C4LIB</a>,
a FORTRAN90 library which
implements certain elementary functions for "C4" or
single precision complex variables;
</p>
<p>
<a href = "../../f_src/c8lib/c8lib.html">
C8LIB</a>,
a FORTRAN90 library which
implements certain elementary functions for "C8" or
double precision complex variables;
</p>
<p>
<a href = "../../f_src/i4lib/i4lib.html">
I4LIB</a>,
a FORTRAN90 library which
contains many utility routines, using "I4" or "single precision integer"
arithmetic.
</p>
<p>
<a href = "../../f_src/r16lib/r16lib.html">
R16LIB</a>,
a FORTRAN90 library which
contains many utility routines, using "R16" or
"quadruple precision real" arithmetic.
</p>
<p>
<a href = "../../f_src/r4lib/r4lib.html">
R4LIB</a>,
a FORTRAN90 library which
contains many utility routines, using "R4" or
"single precision real" arithmetic.
</p>
<p>
<a href = "../../f_src/r8lib/r8lib.html">
R8LIB</a>,
a FORTRAN90 library which
contains many utility routines, using "R8" or
"double precision real" arithmetic.
</p>
<p>
<a href = "../../f_src/subpak/subpak.html">
SUBPAK</a>,
a FORTRAN90 library which
contains many utility routines;
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "i8lib.f90">i8lib.f90</a>, the source code;
</li>
<li>
<a href = "i8lib.sh">i8lib.sh</a>,
commands to compile the source code;
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "i8lib_prb.f90">i8lib_prb.f90</a>, a sample calling
program;
</li>
<li>
<a href = "i8lib_prb.sh">i8lib_prb.sh</a>, commands to
compile, link and run the sample calling program;
</li>
<li>
<a href = "i8lib_prb_output.txt">i8lib_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>I8_BIT_HI1</b> returns the position of the high 1 bit base 2 in an I8.
</li>
<li>
<b>I8_BIT_LO0</b> returns the position of the low 0 bit base 2 in an I8.
</li>
<li>
<b>I8_CHOOSE</b> computes the binomial coefficient C(N,K) as an I8.
</li>
<li>
<b>I8_HUGE</b> returns a "huge" I8.
</li>
<li>
<b>I8_HUGE_NORMALIZER</b> returns the "normalizer" for I8_HUGE.
</li>
<li>
<b>I8_UNIFORM</b> returns a scaled pseudorandom I8.
</li>
<li>
<b>I8_XOR</b> calculates the exclusive OR of two I8's.
</li>
<li>
<b>R8I8_UNIFORM</b> returns a scaled pseudorandom R8 using an I8 seed.
</li>
<li>
<b>R8I8_UNIFORM_01</b> returns a unit pseudorandom R8 using an I8 seed.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 27 June 2010.
</i>
<!-- John Burkardt -->
</body>
</html>