#include "stdio.h"
  #include "13kfft.c"
  #include "math.h"
  main()
  { int i,j;
    double pr[64],pi[64],fr[64],fi[64];
    for (i=0; i<=63; i++)
      { pr[i]=exp(-0.1*(i+0.5)); pi[i]=0.0;}
    printf("\n");
    for (i=0; i<=15; i++)
      { for (j=0; j<=3; j++)
          printf("%e   ",pr[4*i+j]);
        printf("\n");
      }
    printf("\n");
    kfft(pr,pi,64,6,fr,fi,0,1);
    for (i=0; i<=15; i++)
      { for (j=0; j<=3; j++)
          printf("%e   ",fr[4*i+j]);
        printf("\n");
      }
    printf("\n");
    for (i=0; i<=15; i++)
      { for (j=0; j<=3; j++)
          printf("%e   ",fi[4*i+j]);
        printf("\n");
      }
    printf("\n");
    for (i=0; i<=15; i++)
      { for (j=0; j<=3; j++)
          printf("%e   ",pr[4*i+j]);
        printf("\n");
      }
    printf("\n");
    for (i=0; i<=15; i++)
      { for (j=0; j<=3; j++)
          printf("%e   ",pi[4*i+j]);
        printf("\n");
      }
    printf("\n");
    kfft(fr,fi,64,6,pr,pi,1,1);
    for (i=0; i<=15; i++)
      { for (j=0; j<=3; j++)
          printf("%e   ",fr[4*i+j]);
        printf("\n");
      }
    printf("\n");
  }