C8_COMPLEX_LIB, a C++ library which defines complex numbers and the operations necessary to do arithmetic on them.
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.
The C8_COMPLEX class defines a c8_complex number as a pair of doubles. A variable c in this class may be declared by
c8_complex c;
The declaration can include an initialization:
c8_complex c = c8_complex ( 1.0, 2.0 );
A variable c declared as c8_complex may be assigned a value using the c8_complex() function:
c = c8_complex ( a, b )
where a and b are double values; the assignment
c = c8_complex ( a )
sets the real part of c to a, and the imaginary part to 0.
A variable c declared as c8_complex may be used in addition, subtraction, multiplication, or division with another c8_complex value, or a double value:
c3 = c1 + c2;
c3 = c1 - c2;
c3 = c1 * c2;
c3 = c1 / c2;
A variable c declared as c8_complex may be conjugated, or its real or imaginary part may be produced as a double value:
c2 = ~c;
d1 = c1.real ( );
d2 = c1.imaginary ( );
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
C8_COMPLEX_LIB is available in a C version and a C++ version.
C4_COMPLEX_LIB, a C++ library which defines a class called c4_complex for complex numbers with single precision components.
C8LIB,
a C++ library which
implements certain elementary functions for "C8"
or double precision complex variables
using the C++ "complex
CPP, C++ programs which includes an example of the declaration and use of complex variables.