#include <fftw3.h>
int main(int argc, char* *argv)
{
    fftw_complex *in, *out;
    fftw_plan p;
    long N = 1;
    in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N);
    out = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N);
    p = fftw_plan_dft_1d(N, in, out, FFTW_FORWARD, FFTW_ESTIMATE);
    fftw_execute(p); /* repeat as needed */
    fftw_destroy_plan(p);
    fftw_free(in); fftw_free(out);
    return 0;
}