complex<double>

Describes an object that stores an ordered pair of objects both of type double, the first representing the real part of a complex number and the second representing the imaginary part.

template<> class complex { public: complex( double _RealVal = 0, double _ImagVal = 0 ); complex( const complex& _ComplexNum ); explicit complex( const complex& _ComplexNum ); // rest same as template class complex };

_RealVal

The value of type double for the real part of the complex number being constructed.

_ImagVal

The value of type double for the imaginary part of the complex number being constructed.

_ComplexNum

The complex number of type float or of type long double whose real and imaginary parts are used to initialize a complex number of type double being constructed.