./test.o 
Call dft-function forward 1
0.0000  0.00000000
0.0625  0.38268343
0.1250  0.70710678
0.1875  0.92387953
0.2500  1.00000000
0.3125  0.92387953
0.3750  0.70710678
0.4375  0.38268343
0.5000  0.00000000
0.5625  -0.38268343
0.6250  -0.70710678
0.6875  -0.92387953
0.7500  -1.00000000
0.8125  -0.92387953
0.8750  -0.70710678
0.9375  -0.38268343
-0.00000000     0.00000000
-0.00000000     0.50000000
-0.00000000     0.00000000
0.00000000      0.00000000
0.00000000      0.00000000
-0.00000000     0.00000000
-0.00000000     0.00000000
-0.00000000     0.00000000
0.00000000      0.00000000
-0.00000000     0.00000000
-0.00000000     0.00000000
-0.00000000     0.00000000
-0.00000000     0.00000000
-0.00000000     0.00000000
-0.00000000     0.00000000
0.00000000      -0.50000000
Call dft-function reverse 1
0.00000000      0.00000000
0.38268343      0.00000000
0.70710678      0.00000000
0.92387953      0.00000000
1.00000000      0.00000000
0.92387953      0.00000000
0.70710678      0.00000000
0.38268343      0.00000000
-0.00000000     0.00000000
-0.38268343     0.00000000
-0.70710678     0.00000000
-0.92387953     0.00000000
-1.00000000     0.00000000
-0.92387953     0.00000000
-0.70710678     0.00000000
-0.38268343     0.00000000