15.2.1 Constructors of Class complex

There are two constructors for complex. Their definitions are:

complex::complex()            {re=0.0; im=0.0;}
complex::complex(double r, double i = 0.0) {re=r; im=i;}

If you declare a complex variable without specifying parameters, the first constructor is used and the variable is initialized, so that both parts are 0. The following example creates a complex variable whose real and imaginary parts are both 0:

complex aComp;

You can give either one or two parameters. In either case, the second constructor is used. When you give only one parameter, that parameter is taken as the value for the real part and the imaginary part is set to 0. For example:

complex aComp(4.533);

creates a complex variable with the following value:

4.533 + 0i

If you give two values, the first value is taken as the value of the real part and the second as the value of the imaginary part. For example:

complex aComp(8.999, 2.333);

creates a complex variable with the following value:

8.999 + 2.333i

You can also create a complex number using the polar function, which is provided in the complex arithmetic library (see 15.3 Mathematical Functions). The polar function creates a complex value given the polar coordinates magnitude and angle.

There is no destructor for type complex.