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#include <fftw.h>
#include <math.h>
 
int main()
{
        fftw_plan pl1,pl2;
        fftw_complex in[128], mid[128], out[128];
        int i;
 
        for (i=0; i<128; i++)
        {
                in[i].re = sin (M_PI*i/16);
                in[i].im = sin (M_PI*i/24);
        }
 
        pl1 = fftw_create_plan (128, FFTW_FORWARD, FFTW_ESTIMATE);
        pl2 = fftw_create_plan (128, FFTW_BACKWARD, FFTW_ESTIMATE);
 
        fftw_one (pl1, in, mid);
        fftw_one (pl2, mid, out);
        for (i=0; i<128; i++)
        {
                out[i].re /= 128;
                out[i].im /= 128;
        }
 
        fftw_destroy_plan (pl2);
        fftw_destroy_plan (pl1);
 
        for (i=0; i<128; i++)
                printf ("%d: in=(%f,%f), out=(%f,%f), d=(%f,%f)\n", i, in[i].re, in[i].im,
                        out[i].re, out[i].im, out[i].re - in[i].re, out[i].im - in[i].im);
 
        return 0;
}

prog.cpp:1:18: error: fftw.h: No such file or directory
prog.cpp: In function ‘int main()’:
prog.cpp:6: error: ‘fftw_plan’ was not declared in this scope
prog.cpp:6: error: expected `;' before ‘pl1’
prog.cpp:7: error: ‘fftw_complex’ was not declared in this scope
prog.cpp:7: error: expected `;' before ‘in’
prog.cpp:12: error: ‘in’ was not declared in this scope
prog.cpp:16: error: ‘pl1’ was not declared in this scope
prog.cpp:16: error: ‘FFTW_FORWARD’ was not declared in this scope
prog.cpp:16: error: ‘FFTW_ESTIMATE’ was not declared in this scope
prog.cpp:16: error: ‘fftw_create_plan’ was not declared in this scope
prog.cpp:17: error: ‘pl2’ was not declared in this scope
prog.cpp:17: error: ‘FFTW_BACKWARD’ was not declared in this scope
prog.cpp:19: error: ‘in’ was not declared in this scope
prog.cpp:19: error: ‘mid’ was not declared in this scope
prog.cpp:19: error: ‘fftw_one’ was not declared in this scope
prog.cpp:20: error: ‘out’ was not declared in this scope
prog.cpp:27: error: ‘fftw_destroy_plan’ was not declared in this scope
prog.cpp:32: error: ‘printf’ was not declared in this scope

Standard output is empty