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<html>
<head>
<title>
C4_COMPLEX_LIB - A C++ Class for Complex Arithmetic
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
C4_COMPLEX_LIB <br> A C++ Class for Complex Arithmetic
</h1>
<hr>
<p>
<b>C4_COMPLEX_LIB</b>
is a C++ library which
defines complex numbers and
the operations necessary to do arithmetic on them.
</p>
<p>
<i>Since the ANSI C++ standard library now includes a complex class,
the information described here is probably not of practical use.
On the other hand, it may be helpful as a practical demonstration
of how to define a useful arithmetic class.</i>
</p>
<p>
The <b>C4_COMPLEX</b> class defines a <i>c4_complex</i> number as a pair
of floats. A variable <b>c</b> in this class
may be declared by
<pre><code>
c4_complex c;
</code></pre>
The declaration can include an initialization:
<pre><code>
c4_complex c = c4_complex ( 1.0, 2.0 );
</code></pre>
</p>
<p>
A variable <b>c</b> declared as <i>c4_complex</i> may be assigned a value
using the <i>c4_complex()</i> function:
<pre><code>
c = c4_complex ( a, b )
</code></pre>
where <b>a</b> and <b>b</b> are float values; the assignment
<pre><code>
c = c4_complex ( a )
</code></pre>
sets the real part of <b>c</b> to <b>a</b>, and the imaginary part to 0.
</p>
<p>
A variable <b>c</b> declared as <i>c4_complex</i> may be used in addition,
subtraction, multiplication, or division with another c4_complex value,
or a float value:
<pre><code>
c3 = c1 + c2;
c3 = c1 - c2;
c3 = c1 * c2;
c3 = c1 / c2;
</code></pre>
</p>
<p>
A variable <b>c</b> declared as <i>c4_complex</i> may be conjugated, or
its real or imaginary part may be produced as a float value:
<pre><code>
c2 = ~c;
d1 = c1.real ( );
d2 = c1.imaginary ( );
</code></pre>
</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>C4_COMPLEX_LIB</b> is available in
<a href = "../../c_src/c4_complex_lib/c4_complex_lib.html">a C version</a> and
<a href = "../../cpp_src/c4_complex_lib/c4_complex_lib.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/c4lib/c4lib.html">
C4LIB</a>,
a C++ library which
implements certain elementary functions for "C4"
or single precision complex variables
using the C++ "complex <float>" datatype.
</p>
<p>
<a href = "../../cpp_src/c8_complex_lib/c8_complex_lib.html">
C8_COMPLEX_LIB</a>,
a C++ library which
defines a class called c8_complex for complex numbers with
double precision components.
</p>
<p>
<a href = "../../cpp_src/cpp/cpp.html">
CPP</a>,
C++ programs which
includes an example of
the declaration and use of complex variables.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Steve Oualline,<br>
Practical C++ Programming,<br>
O'Reilly & Associates, 1997,<br>
ISBN: 1-56592-139-9
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "c4_complex_lib.cpp">c4_complex_lib.cpp</a>, the source code;
</li>
<li>
<a href = "c4_complex_lib.hpp">c4_complex_lib.hpp</a>, the include file.
</li>
<li>
<a href = "c4_complex_lib.sh">c4_complex_lib.sh</a>,
commands to compile the source code;
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "c4_complex_lib_prb.cpp">c4_complex_lib_prb.cpp</a>, the calling program;
</li>
<li>
<a href = "c4_complex_lib_prb.sh">c4_complex_lib_prb.sh</a>,
commands to compile, link and run the calling program;
</li>
<li>
<a href = "c4_complex_lib_prb_output.txt">c4_complex_lib_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 27 September 2013.
</i>
<!-- John Burkardt -->
</body>
</html>