bigrat - Transparent BigNumber/BigRational support for Perl

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Integer and floating-point constants are created as proper BigInts or BigFloats, respectively.</p> <p>Other than <a href="/5.8.5/bignum">bignum</a>, this module upgrades to Math::BigRat, meaning that instead of 2.5 you will get 2+1/2 as output.</p> <h2 id="MODULES-USED"><a class="permalink" href="#MODULES-USED">#</a><a id="MODULES"></a>MODULES USED</h2> <p><code>bigrat</code> is just a thin wrapper around various modules of the Math::BigInt family. Think of it as the head of the family, who runs the shop, and orders the others to do the work.</p> <p>The following modules are currently used by bignum:</p> <pre><code class="plaintext">Math::BigInt::Lite (for speed, and only if it is loadable) Math::BigInt Math::BigFloat Math::BigRat</code></pre> <h2 id="MATH-LIBRARY"><a class="permalink" href="#MATH-LIBRARY">#</a><a id="MATH"></a>MATH LIBRARY</h2> <p>Math with the numbers is done (by default) by a module called Math::BigInt::Calc. This is equivalent to saying:</p> <pre><code>use bigrat lib => 'Calc';</code></pre> <p>You can change this by using:</p> <pre><code>use bigrat lib => 'BitVect';</code></pre> <p>The following would first try to find Math::BigInt::Foo, then Math::BigInt::Bar, and when this also fails, revert to Math::BigInt::Calc:</p> <pre><code>use bigrat lib => 'Foo,Math::BigInt::Bar';</code></pre> <p>Please see respective module documentation for further details.</p> <h2 id="SIGN"><a class="permalink" href="#SIGN">#</a>SIGN</h2> <p>The sign is either '+', '-', 'NaN', '+inf' or '-inf' and stored seperately.</p> <p>A sign of 'NaN' is used to represent the result when input arguments are not numbers or as a result of 0/0. '+inf' and '-inf' represent plus respectively minus infinity. You will get '+inf' when dividing a positive number by 0, and '-inf' when dividing any negative number by 0.</p> <h2 id="METHODS"><a class="permalink" href="#METHODS">#</a>METHODS</h2> <p>Since all numbers are not objects, you can use all functions that are part of the BigInt or BigFloat API. It is wise to use only the bxxx() notation, and not the fxxx() notation, though. This makes you independed on the fact that the underlying object might morph into a different class than BigFloat.</p> <h2 id="CAVEAT"><a class="permalink" href="#CAVEAT">#</a>CAVEAT</h2> <p>But a warning is in order. When using the following to make a copy of a number, only a shallow copy will be made.</p> <pre><code>$x = 9; $y = $x; $x = $y = 7;</code></pre> <p>Using the copy or the original with overloaded math is okay, e.g. the following work:</p> <pre><code>$x = 9; $y = $x; print $x + 1, " ", $y,"\n"; # prints 10 9</code></pre> <p>but calling any method that modifies the number directly will result in <b>both</b> the original and the copy beeing destroyed:</p> <pre><code>$x = 9; $y = $x; print $x->badd(1), " ", $y,"\n"; # prints 10 10 $x = 9; $y = $x; print $x->binc(1), " ", $y,"\n"; # prints 10 10 $x = 9; $y = $x; print $x->bmul(2), " ", $y,"\n"; # prints 18 18</code></pre> <p>Using methods that do not modify, but testthe contents works:</p> <pre><code>$x = 9; $y = $x; $z = 9 if $x->is_zero(); # works fine</code></pre> <p>See the documentation about the copy constructor and <code>=</code> in overload, as well as the documentation in BigInt for further details.</p> <h1 id="EXAMPLES"><a class="permalink" href="#EXAMPLES">#</a>EXAMPLES</h1> <pre><code>perl -Mbigrat -le 'print sqrt(33)' perl -Mbigrat -le 'print 2*255' perl -Mbigrat -le 'print 4.5+2*255' perl -Mbigrat -le 'print 3/7 + 5/7 + 8/3' perl -Mbigrat -le 'print 12->is_odd()';</code></pre> <h1 id="LICENSE"><a class="permalink" href="#LICENSE">#</a>LICENSE</h1> <p>This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.</p> <h1 id="SEE-ALSO"><a class="permalink" href="#SEE-ALSO">#</a><a id="SEE"></a>SEE ALSO</h1> <p>Especially <a href="/5.8.5/bignum">bignum</a>.</p> <p><a href="/5.8.5/Math::BigFloat">Math::BigFloat</a>, <a href="/5.8.5/Math::BigInt">Math::BigInt</a>, <a href="/5.8.5/Math::BigRat">Math::BigRat</a> and <a href="/5.8.5/Math::Big">Math::Big</a> as well as <a href="/5.8.5/Math::BigInt::BitVect">Math::BigInt::BitVect</a>, <a href="/5.8.5/Math::BigInt::Pari">Math::BigInt::Pari</a> and <a href="/5.8.5/Math::BigInt::GMP">Math::BigInt::GMP</a>.</p> <h1 id="AUTHORS"><a class="permalink" href="#AUTHORS">#</a>AUTHORS</h1> <p>(C) by Tels <a href="http://bloodgate.com/">http://bloodgate.com/</a> in early 2002.</p> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). Please contact him via the <a href="https://github.com/Grinnz/perldoc-browser/issues">GitHub issue tracker</a> or <a href="mailto:dbook@cpan.org">email</a> regarding any issues with the site itself, search, or rendering of documentation.</p> <p>The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via the <a href="https://github.com/Perl/perl5/issues">Perl issue tracker</a>, the <a href="https://lists.perl.org/list/perl5-porters.html">mailing list</a>, or <a href="https://kiwiirc.com/client/irc.perl.org/p5p">IRC</a> to report any issues with the contents or format of the documentation.</p> </div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.slim.min.js" integrity="sha512-/DXTXr6nQodMUiq+IUJYCt2PPOUjrHJ9wFrqpJ3XkgPNOZVfMok7cRw6CSxyCQxXn6ozlESsSh1/sMCTF1rL/g==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.1/umd/popper.min.js" integrity="sha512-ubuT8Z88WxezgSqf3RLuNi5lmjstiJcyezx34yIU2gAHonIi27Na7atqzUZCOoY4CExaoFumzOsFQ2Ch+I/HCw==" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script> <script src="/js/highlight.pack.js"></script> <script>hljs.highlightAll();</script> </body> </html>

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bigrat - Transparent BigNumber/BigRational support for Perl - Perldoc Browser