diff --git a/lib/Makefile.am b/lib/Makefile.am
index 4f7bf70..81aea31 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -99,6 +99,8 @@ libhcl_la_LIBADD += -lhcl-dic
 libhcl_la_DEPENDENCIES += $(abs_builddir)/../mod/libhcl-dic.la
 libhcl_la_LIBADD += -lhcl-str
 libhcl_la_DEPENDENCIES += $(abs_builddir)/../mod/libhcl-str.la
+libhcl_la_LIBADD += -lhcl-sys
+libhcl_la_DEPENDENCIES += $(abs_builddir)/../mod/libhcl-sys.la
 endif
 
 bin_PROGRAMS = hcl
diff --git a/lib/Makefile.in b/lib/Makefile.in
index ea4b38e..b3563fa 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -94,10 +94,11 @@ host_triplet = @host@
 @MACOSX_TRUE@@WIN32_FALSE@am__append_4 = -DHCL_DEFAULT_PFMODPOSTFIX=\".dylib\"
 @MACOSX_FALSE@@WIN32_FALSE@am__append_5 = -DHCL_DEFAULT_PFMODPOSTFIX=\".so\"
 @ENABLE_STATIC_MODULE_TRUE@am__append_6 = -lhcl-arr -lhcl-dic \
-@ENABLE_STATIC_MODULE_TRUE@	-lhcl-str
+@ENABLE_STATIC_MODULE_TRUE@	-lhcl-str -lhcl-sys
 @ENABLE_STATIC_MODULE_TRUE@am__append_7 = $(abs_builddir)/../mod/libhcl-arr.la \
 @ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-dic.la \
-@ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-str.la
+@ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-str.la \
+@ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-sys.la
 bin_PROGRAMS = hcl$(EXEEXT) $(am__EXEEXT_1)
 @ENABLE_HCLEX_TRUE@am__append_8 = libhclex.la
 @ENABLE_HCLEX_TRUE@am__append_9 = hcl-c.h hcl-s.h hcl-tmr.h hcl-xutl.h hcl-json.h
@@ -425,7 +426,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
diff --git a/lib/bigint.c b/lib/bigint.c
index 1a8438c..c676c65 100644
--- a/lib/bigint.c
+++ b/lib/bigint.c
@@ -396,7 +396,7 @@ int hcl_inttooow (hcl_t* hcl, hcl_oop_t x, hcl_oow_t* w)
 		}
 	}
 
-	if (is_bigint(hcl, x)) return bigint_to_oow (hcl, x, w);
+	if (is_bigint(hcl, x)) return bigint_to_oow(hcl, x, w);
 
 	hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not integer - %O", x);
 	return 0; /* not convertable - too big, too small, or not integer */
diff --git a/lib/hcl.c b/lib/hcl.c
index 0e66d38..b8def0d 100644
--- a/lib/hcl.c
+++ b/lib/hcl.c
@@ -513,6 +513,7 @@ void hcl_freemem (hcl_t* hcl, void* ptr)
 #include "../mod/_arr.h"
 #include "../mod/_dic.h"
 #include "../mod/_str.h"
+#include "../mod/_sys.h"
 
 static struct
 {
@@ -523,7 +524,8 @@ static_modtab[] =
 {
 	{ "arr",      hcl_mod_arr },
 	{ "dic",      hcl_mod_dic },
-	{ "str",      hcl_mod_str }
+	{ "str",      hcl_mod_str },
+	{ "sys",      hcl_mod_sys }
 };
 #endif
 
diff --git a/lib/main.c b/lib/main.c
index a0a93a9..dd59063 100644
--- a/lib/main.c
+++ b/lib/main.c
@@ -1174,7 +1174,7 @@ count++;
 
 			code_offset = hcl_getbclen(hcl);
 
-			/*hcl_proutbfmt (hcl, 0, "\n");*/
+			if (verbose) hcl_proutbfmt (hcl, 0, "\n"); /* flush the output buffer by hcl_print above */
 			if (hcl_compile(hcl, obj) <= -1)
 			{
 				if (hcl->errnum == HCL_ESYNERR)
diff --git a/mod/Makefile.am b/mod/Makefile.am
index 2f8ade8..41b638e 100644
--- a/mod/Makefile.am
+++ b/mod/Makefile.am
@@ -22,6 +22,7 @@ noinst_LTLIBRARIES =
 noinst_LTLIBRARIES += libhcl-arr.la
 noinst_LTLIBRARIES += libhcl-dic.la
 noinst_LTLIBRARIES += libhcl-str.la
+noinst_LTLIBRARIES += libhcl-sys.la
 
 else
 
@@ -37,6 +38,7 @@ pkgmodexec_LTLIBRARIES =
 pkgmodexec_LTLIBRARIES += libhcl-arr.la 
 pkgmodexec_LTLIBRARIES += libhcl-dic.la 
 pkgmodexec_LTLIBRARIES += libhcl-str.la 
+pkgmodexec_LTLIBRARIES += libhcl-sys.la 
 
 endif
 
@@ -54,3 +56,8 @@ libhcl_str_la_SOURCES = str.c _str.h
 libhcl_str_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 libhcl_str_la_LDFLAGS = $(LDFLAGS_COMMON)
 libhcl_str_la_LIBADD = $(LIBADD_COMMON) 
+
+libhcl_sys_la_SOURCES = sys.c _sys.h
+libhcl_sys_la_CPPFLAGS = $(CPPFLAGS_COMMON)
+libhcl_sys_la_LDFLAGS = $(LDFLAGS_COMMON)
+libhcl_sys_la_LIBADD = $(LIBADD_COMMON) 
diff --git a/mod/Makefile.in b/mod/Makefile.in
index 24ca5bb..94b8cf8 100644
--- a/mod/Makefile.in
+++ b/mod/Makefile.in
@@ -164,6 +164,15 @@ libhcl_str_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 @ENABLE_STATIC_MODULE_FALSE@am_libhcl_str_la_rpath = -rpath \
 @ENABLE_STATIC_MODULE_FALSE@	$(pkgmodexecdir)
 @ENABLE_STATIC_MODULE_TRUE@am_libhcl_str_la_rpath =
+libhcl_sys_la_DEPENDENCIES = $(am__DEPENDENCIES_1)
+am_libhcl_sys_la_OBJECTS = libhcl_sys_la-sys.lo
+libhcl_sys_la_OBJECTS = $(am_libhcl_sys_la_OBJECTS)
+libhcl_sys_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(libhcl_sys_la_LDFLAGS) $(LDFLAGS) -o $@
+@ENABLE_STATIC_MODULE_FALSE@am_libhcl_sys_la_rpath = -rpath \
+@ENABLE_STATIC_MODULE_FALSE@	$(pkgmodexecdir)
+@ENABLE_STATIC_MODULE_TRUE@am_libhcl_sys_la_rpath =
 AM_V_P = $(am__v_P_@AM_V@)
 am__v_P_ = $(am__v_P_@AM_DEFAULT_V@)
 am__v_P_0 = false
@@ -199,9 +208,9 @@ am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
 am__v_CCLD_0 = @echo "  CCLD    " $@;
 am__v_CCLD_1 = 
 SOURCES = $(libhcl_arr_la_SOURCES) $(libhcl_dic_la_SOURCES) \
-	$(libhcl_str_la_SOURCES)
+	$(libhcl_str_la_SOURCES) $(libhcl_sys_la_SOURCES)
 DIST_SOURCES = $(libhcl_arr_la_SOURCES) $(libhcl_dic_la_SOURCES) \
-	$(libhcl_str_la_SOURCES)
+	$(libhcl_str_la_SOURCES) $(libhcl_sys_la_SOURCES)
 am__can_run_installinfo = \
   case $$AM_UPDATE_INFO_DIR in \
     n|no|NO) false;; \
@@ -372,7 +381,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -402,10 +410,12 @@ CPPFLAGS_COMMON = \
 @ENABLE_STATIC_MODULE_FALSE@LIBADD_COMMON = -lhcl
 @ENABLE_STATIC_MODULE_TRUE@LIBADD_COMMON = 
 @ENABLE_STATIC_MODULE_TRUE@noinst_LTLIBRARIES = libhcl-arr.la \
-@ENABLE_STATIC_MODULE_TRUE@	libhcl-dic.la libhcl-str.la
+@ENABLE_STATIC_MODULE_TRUE@	libhcl-dic.la libhcl-str.la \
+@ENABLE_STATIC_MODULE_TRUE@	libhcl-sys.la
 @ENABLE_STATIC_MODULE_FALSE@pkgmodexecdir = $(libdir)
 @ENABLE_STATIC_MODULE_FALSE@pkgmodexec_LTLIBRARIES = libhcl-arr.la \
-@ENABLE_STATIC_MODULE_FALSE@	libhcl-dic.la libhcl-str.la
+@ENABLE_STATIC_MODULE_FALSE@	libhcl-dic.la libhcl-str.la \
+@ENABLE_STATIC_MODULE_FALSE@	libhcl-sys.la
 libhcl_arr_la_SOURCES = arr.c _arr.h
 libhcl_arr_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 libhcl_arr_la_LDFLAGS = $(LDFLAGS_COMMON)
@@ -418,6 +428,10 @@ libhcl_str_la_SOURCES = str.c _str.h
 libhcl_str_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 libhcl_str_la_LDFLAGS = $(LDFLAGS_COMMON)
 libhcl_str_la_LIBADD = $(LIBADD_COMMON) 
+libhcl_sys_la_SOURCES = sys.c _sys.h
+libhcl_sys_la_CPPFLAGS = $(CPPFLAGS_COMMON)
+libhcl_sys_la_LDFLAGS = $(LDFLAGS_COMMON)
+libhcl_sys_la_LIBADD = $(LIBADD_COMMON) 
 all: all-am
 
 .SUFFIXES:
@@ -507,6 +521,9 @@ libhcl-dic.la: $(libhcl_dic_la_OBJECTS) $(libhcl_dic_la_DEPENDENCIES) $(EXTRA_li
 libhcl-str.la: $(libhcl_str_la_OBJECTS) $(libhcl_str_la_DEPENDENCIES) $(EXTRA_libhcl_str_la_DEPENDENCIES) 
 	$(AM_V_CCLD)$(libhcl_str_la_LINK) $(am_libhcl_str_la_rpath) $(libhcl_str_la_OBJECTS) $(libhcl_str_la_LIBADD) $(LIBS)
 
+libhcl-sys.la: $(libhcl_sys_la_OBJECTS) $(libhcl_sys_la_DEPENDENCIES) $(EXTRA_libhcl_sys_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libhcl_sys_la_LINK) $(am_libhcl_sys_la_rpath) $(libhcl_sys_la_OBJECTS) $(libhcl_sys_la_LIBADD) $(LIBS)
+
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
 
@@ -516,6 +533,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_arr_la-arr.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_dic_la-dic.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_str_la-str.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhcl_sys_la-sys.Plo@am__quote@
 
 .c.o:
 @am__fastdepCC_TRUE@	$(AM_V_CC)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
@@ -562,6 +580,13 @@ libhcl_str_la-str.lo: str.c
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_str_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libhcl_str_la-str.lo `test -f 'str.c' || echo '$(srcdir)/'`str.c
 
+libhcl_sys_la-sys.lo: sys.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_sys_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libhcl_sys_la-sys.lo -MD -MP -MF $(DEPDIR)/libhcl_sys_la-sys.Tpo -c -o libhcl_sys_la-sys.lo `test -f 'sys.c' || echo '$(srcdir)/'`sys.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhcl_sys_la-sys.Tpo $(DEPDIR)/libhcl_sys_la-sys.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='sys.c' object='libhcl_sys_la-sys.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_sys_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libhcl_sys_la-sys.lo `test -f 'sys.c' || echo '$(srcdir)/'`sys.c
+
 mostlyclean-libtool:
 	-rm -f *.lo
 
diff --git a/mod/_sys.h b/mod/_sys.h
new file mode 100644
index 0000000..a1d08cb
--- /dev/null
+++ b/mod/_sys.h
@@ -0,0 +1,43 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2016-2018 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _HCL_MOD_SYS_H_
+#define _HCL_MOD_SYS_H_
+
+#include <hcl.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+HCL_EXPORT int hcl_mod_sys (hcl_t* hcl, hcl_mod_t* mod);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+
diff --git a/mod/sys.c b/mod/sys.c
new file mode 100644
index 0000000..c84e421
--- /dev/null
+++ b/mod/sys.c
@@ -0,0 +1,93 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2016-2018 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "_sys.h"
+#include <stdlib.h>
+
+static hcl_pfrc_t pf_sys_time (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
+{
+	hcl_ntime_t now;
+	hcl_oop_t tv;
+	hcl->vmprim.gettime(hcl, &now);
+	tv = hcl_oowtoint(hcl, now.sec);
+	if (!tv) return HCL_PF_FAILURE;
+	HCL_STACK_SETRET (hcl, nargs, tv);
+	return HCL_PF_SUCCESS;
+}
+
+static hcl_pfrc_t pf_sys_srandom (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
+{
+	hcl_oop_t seed;
+	hcl_oow_t seedw;
+
+	seed = HCL_STACK_GETARG(hcl, nargs, 0);
+	if (hcl_inttooow(hcl, seed, &seedw) == 0)
+	{
+		const hcl_ooch_t* orgmsg = hcl_backuperrmsg(hcl);
+		hcl_seterrbfmt (hcl, HCL_EINVAL, "unacceptiable seed - %O - %js", seed, orgmsg);
+		return HCL_PF_FAILURE;
+	}
+
+	srandom (seedw);
+	HCL_STACK_SETRET (hcl, nargs, hcl->_nil);
+	return HCL_PF_SUCCESS;
+}
+
+static hcl_pfrc_t pf_sys_random (hcl_t* hcl, hcl_mod_t* mod, hcl_ooi_t nargs)
+{
+	long int r = random();
+	hcl_ooi_t rv = (hcl_ooi_t)(r % HCL_SMOOI_MAX);
+	HCL_STACK_SETRET (hcl, nargs, HCL_SMOOI_TO_OOP(rv));
+	return HCL_PF_SUCCESS;
+}
+
+static hcl_pfinfo_t pfinfos[] =
+{
+	/*{ { 'V','A','R','\0' },                  { HCL_PFBASE_VAR,  HCL_NULL,           0,  0 } },*/
+	{ { 'r','a','n','d','o','m','\0' },      { HCL_PFBASE_FUNC,  pf_sys_random,       0,  0 } },
+	{ { 's','r','a','n','d','o','m','\0' },  { HCL_PFBASE_FUNC,  pf_sys_srandom,      1,  1 } },
+	{ { 't','i','m','e','\0' },              { HCL_PFBASE_FUNC,  pf_sys_time,         0,  0 } }
+};
+
+/* ------------------------------------------------------------------------ */
+
+static hcl_pfbase_t* query (hcl_t* hcl, hcl_mod_t* mod, const hcl_ooch_t* name, hcl_oow_t namelen)
+{
+	return hcl_findpfbase(hcl, pfinfos, HCL_COUNTOF(pfinfos), name, namelen);
+}
+
+static void unload (hcl_t* hcl, hcl_mod_t* mod)
+{
+}
+
+int hcl_mod_sys (hcl_t* hcl, hcl_mod_t* mod)
+{
+	mod->query = query;
+	mod->unload = unload; 
+	mod->ctx = HCL_NULL;
+	return 0;
+}
diff --git a/t/test-bi.hcl b/t/test-bi.hcl
new file mode 100644
index 0000000..502bebf
--- /dev/null
+++ b/t/test-bi.hcl
@@ -0,0 +1,36 @@
+## test big integer operations
+## hcl --log /dev/null,warn+ test-bi.hcl
+
+(sys.srandom (sys.time))
+(set count 0)
+(while true
+	(printf "%O\r" count)
+	(set count (+ count 1))
+
+	(set limit (rem (sys.random) 30))
+	(set dividend (sys.random))
+	(set i 1)
+	(while (< i limit)
+		(set dividend (bit-or (bit-shift dividend 30) (sys.random)))
+		(set i (+ i 1))
+	)
+
+	(set limit (rem (sys.random) 30))
+	(set divisor (sys.random))
+	(set i 1)
+	(while (< i limit)
+		(set divisor (bit-or (bit-shift divisor 30) (sys.random)))
+		(set i (+ i 1))
+	)
+
+	(set quotient (/ dividend divisor))
+	(set remainder (rem dividend divisor))
+	(set derived_dividend (+ (* quotient divisor) remainder))
+
+	(if (/= dividend derived_dividend)
+		(printf ">> dividend %O\n>> divisor %O\n>> quotient %O\n>> remainder %O\n>> derived_dividend %O\n"
+			dividend divisor quotient remainder derived_dividend)
+		(break)
+	)
+)
+(printf "\n")
diff --git a/t/test-bi.sh b/t/test-bi.sh
deleted file mode 100644
index d603ccb..0000000
--- a/t/test-bi.sh
+++ /dev/null
@@ -1,35 +0,0 @@
-count=0
-while true
-do
-	/bin/echo -n -e "$count\r"
-	count=$(($count + 1))
-
-	a=`openssl rand -hex 1 | tr '[a-z]' '[A-Z]'`
-	a=$(echo -e "(printf \"%O\" #x$a)"  | ~/xxx/bin/hcl --log /dev/null /dev/stdin)
-	[ "$a" = "0" ] && a=1
-	a=`openssl rand -hex $a | tr '[a-z]' '[A-Z]'`
-	
-	
-	b=`openssl rand -hex 1 | tr '[a-z]' '[A-Z]'`
-	b=$(echo -e "(printf \"%O\" #x$b)"  | ~/xxx/bin/hcl --log /dev/null /dev/stdin)
-	[ "$b" = "0" ]  && b=1
-	b=`openssl rand -hex $b | tr '[a-z]' '[A-Z]'`
-	
-	a=$(echo -e "(printf \"%O\" #x$a)"  | ~/xxx/bin/hcl --log /dev/null /dev/stdin)
-	b=$(echo -e "(printf \"%O\" #x$b)"  | ~/xxx/bin/hcl --log /dev/null /dev/stdin)
-	[ "$b" = "0" ] && b=1
-
-	q=$(echo -e "(printf \"%O\" (/ $a $b))"  | ~/xxx/bin/hcl --log /dev/null /dev/stdin)
-	r=$(echo -e "(printf \"%O\" (rem $a $b))"  | ~/xxx/bin/hcl --log /dev/null /dev/stdin)
-	a1=$(echo -e "(printf \"%O\" (+ (* $q $b) $r))"  | ~/xxx/bin/hcl --log /dev/null /dev/stdin)
-	
-	if [ "$a" != "$a1" ]
-	then
-		echo "a=>$a"
-		echo "b=>$b"
-		echo "q=>$q"
-		echo "r=>$r"
-		echo "a1=>$a1"
-		break
-	fi
-done