diff --git a/fft.h b/fft.h
index e36a2f9..e516e21 100644
--- a/fft.h
+++ b/fft.h
@@ -21,4 +21,4 @@ extern fixed Sinewave[N_WAVE];
 fixed fix_mpy(fixed a, fixed b);
 int fix_fft(fixed *fr, fixed *fi, int m, int inverse);
 
-#endif	//FFT_H
+#endif //FFT_H
diff --git a/main.c b/main.c
index af8873c..e958655 100644
--- a/main.c
+++ b/main.c
@@ -1,8 +1,8 @@
 //main.c
 
 
-#include 		"fft.h"
-#include 		"fft-org.h"
+#include        "fft.h"
+#include        "fft-org.h"
 #include        <stdio.h>
 #include        <math.h>
 
@@ -12,9 +12,25 @@
 //number of points
 #define N       (1<<M)
 
+#define M2    100
+#define N2    (3<<M)
+
 fixed real[N], imag[N];
 fixed real_org[N], imag_org[N];
 
+void show_result(fixed* real, fixed* real_org, fixed* imag, fixed* imag_org, int n)
+{
+    int i;
+    for (i=0; i<n; i++)
+    {
+        printf("%d: %d, %d", i, real[i], imag[i]);
+        if (real[i] != real_org[i] || imag[i] != imag_org[i]) {
+            printf(" expected (%d, %d)", real_org[i], imag_org[i]);
+        }
+        printf("\n");
+    }
+}
+
 int main()
 {
     int i;
@@ -22,7 +38,7 @@ int main()
     for(i=0; i<N; i++)
     {
         real[i] = 1000*cos(i*2*3.1415926535/N);
-        real_org[i] = 1000*cos(i*2*3.1415926535/N);
+        real_org[i] = real[i];
         imag[i] = 0;
         imag_org[i] = 0;
     }
@@ -37,33 +53,39 @@ int main()
 
     //FFT
     fix_fft(real, imag, M, 0);
-    fix_fft(real_org, imag_org, M, 0);
+    fix_fft_org(real_org, imag_org, M, 0);
 
     printf("\nFFT\n");
-    for (i=0; i<N; i++)
-    {
-        printf("%d: %d, %d", i, real[i], imag[i]);
-		if (real[i] != real_org[i] || imag[i] != imag_org[i]) {
-			printf(" expected (%d, %d)", real_org[i], imag_org[i]);
-		}
-        printf("\n");
-    }
-
+    show_result(real, real_org, imag, imag_org, N);
 
     //IFFT
     fix_fft(real, imag, M, 1);
-    fix_fft(real_org, imag_org, M, 1);
+    fix_fft_org(real_org, imag_org, M, 1);
 
     printf("\nIFFT\n");
-    for (i=0; i<N; i++)
+    show_result(real, real_org, imag, imag_org, N);
+
+    for(i=0; i<N; i++)
     {
-        printf("%d: %d, %d", i, real[i], imag[i]);
-		if (real[i] != real_org[i] || imag[i] != imag_org[i]) {
-			printf(" expected (%d, %d)", real_org[i], imag_org[i]);
-		}
-        printf("\n");
+        real[i] = 1000*(cos(i*2*3.1415926535/N) + sin(i*2*3.1415926535/N));
+        real_org[i] = real[i];
+        imag[i] = 0;
+        imag_org[i] = 0;
     }
 
+    //FFT
+    fix_fft(real, imag, M, 0);
+    fix_fft_org(real_org, imag_org, M, 0);
+
+    printf("\nFFT2\n");
+    show_result(real, real_org, imag, imag_org, N);
+
+    //IFFT
+    fix_fft(real, imag, M, 1);
+    fix_fft_org(real_org, imag_org, M, 1);
+
+    printf("\nIFFT2\n");
+    show_result(real, real_org, imag, imag_org, N);
 
     return 0;
 }