This is a utility function for use in conjunction with nag_fft_complex (c06ecc)
to calculate inverse discrete Fourier transforms.
The time taken is negligible.
This program reads in a sequence of complex data values and prints their inverse discrete Fourier transform as computed by calling nag_conjugate_complex (c06gcc), followed by nag_fft_complex (c06ecc)
and nag_conjugate_complex (c06gcc) again.