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diff --git a/tutorial01/leptjson.c b/tutorial01/leptjson.c
index 5299fe1d..87e7f934 100644
--- a/tutorial01/leptjson.c
+++ b/tutorial01/leptjson.c
@@ -1,47 +1,87 @@
 #include "leptjson.h"
-#include <assert.h>  /* assert() */
-#include <stdlib.h>  /* NULL */
+#include <assert.h> /* assert() */
+#include <stdlib.h> /* NULL */
 
-#define EXPECT(c, ch)       do { assert(*c->json == (ch)); c->json++; } while(0)
+#define EXPECT(c, ch)         \
+  do {                        \
+    assert(*c->json == (ch)); \
+    c->json++;                \
+  } while (0)
 
 typedef struct {
-    const char* json;
-}lept_context;
-
-static void lept_parse_whitespace(lept_context* c) {
-    const char *p = c->json;
-    while (*p == ' ' || *p == '\t' || *p == '\n' || *p == '\r')
-        p++;
-    c->json = p;
+  const char *json;
+} lept_context;
+
+static void lept_parse_whitespace(lept_context *c) {
+  const char *p = c->json;
+  while (*p == ' ' || *p == '\t' || *p == '\n' || *p == '\r')
+    p++;
+  c->json = p;
 }
 
-static int lept_parse_null(lept_context* c, lept_value* v) {
-    EXPECT(c, 'n');
-    if (c->json[0] != 'u' || c->json[1] != 'l' || c->json[2] != 'l')
-        return LEPT_PARSE_INVALID_VALUE;
-    c->json += 3;
-    v->type = LEPT_NULL;
-    return LEPT_PARSE_OK;
+static int lept_parse_null(lept_context *c, lept_value *v) {
+  EXPECT(c, 'n');
+  if (c->json[0] != 'u' || c->json[1] != 'l' || c->json[2] != 'l')
+    return LEPT_PARSE_INVALID_VALUE;
+  c->json += 3;
+  v->type = LEPT_NULL;
+  return LEPT_PARSE_OK;
 }
 
-static int lept_parse_value(lept_context* c, lept_value* v) {
-    switch (*c->json) {
-        case 'n':  return lept_parse_null(c, v);
-        case '\0': return LEPT_PARSE_EXPECT_VALUE;
-        default:   return LEPT_PARSE_INVALID_VALUE;
-    }
+static int lept_parse_true(lept_context *c, lept_value *v) {
+  EXPECT(c, 't');
+  if (c->json[0] != 'r' || c->json[1] != 'u' || c->json[2] != 'e') {
+    return LEPT_PARSE_INVALID_VALUE;
+  }
+  c->json += 3;
+  v->type = LEPT_TRUE;
+  return LEPT_PARSE_OK;
+}
+
+static int lept_parse_false(lept_context *c, lept_value *v) {
+  EXPECT(c, 'f');
+  if (c->json[0] != 'a' || c->json[1] != 'l' || c->json[2] != 's' ||
+      c->json[3] != 'e') {
+    return LEPT_PARSE_INVALID_VALUE;
+  }
+  c->json += 4;
+  v->type = LEPT_FALSE;
+  return LEPT_PARSE_OK;
 }
 
-int lept_parse(lept_value* v, const char* json) {
-    lept_context c;
-    assert(v != NULL);
-    c.json = json;
-    v->type = LEPT_NULL;
+static int lept_parse_value(lept_context *c, lept_value *v) {
+  switch (*c->json) {
+  case 'n':
+    return lept_parse_null(c, v);
+  case '\0':
+    return LEPT_PARSE_EXPECT_VALUE;
+  case 't':
+    return lept_parse_true(c, v);
+  case 'f':
+    return lept_parse_false(c, v);
+  default:
+    return LEPT_PARSE_INVALID_VALUE;
+  }
+}
+
+int lept_parse(lept_value *v, const char *json) {
+  lept_context c;
+  int res;
+  assert(v != NULL);
+  c.json = json;
+  v->type = LEPT_NULL;
+  lept_parse_whitespace(&c);
+  res = lept_parse_value(&c, v);
+  if (res == LEPT_PARSE_OK) {
     lept_parse_whitespace(&c);
-    return lept_parse_value(&c, v);
+    if (c.json[0] != '\0') {
+      res = LEPT_PARSE_ROOT_NOT_SINGULAR;
+    }
+  }
+  return res;
 }
 
-lept_type lept_get_type(const lept_value* v) {
-    assert(v != NULL);
-    return v->type;
+lept_type lept_get_type(const lept_value *v) {
+  assert(v != NULL);
+  return v->type;
 }
diff --git a/tutorial01/test.c b/tutorial01/test.c
index e7672181..2098ec3b 100644
--- a/tutorial01/test.c
+++ b/tutorial01/test.c
@@ -27,6 +27,21 @@ static void test_parse_null() {
     EXPECT_EQ_INT(LEPT_NULL, lept_get_type(&v));
 }
 
+static void test_parse_true() {
+    lept_value v;
+    v.type = LEPT_NULL;
+    EXPECT_EQ_INT(LEPT_PARSE_OK, lept_parse(&v, "true"));
+    EXPECT_EQ_INT(LEPT_TRUE, lept_get_type(&v));
+}
+
+static void test_parse_false() {
+    lept_value v;
+    v.type = LEPT_NULL;
+    EXPECT_EQ_INT(LEPT_PARSE_OK, lept_parse(&v, "false"));
+    EXPECT_EQ_INT(LEPT_FALSE, lept_get_type(&v));
+}
+
+
 static void test_parse_expect_value() {
     lept_value v;
 
@@ -59,6 +74,8 @@ static void test_parse_root_not_singular() {
 
 static void test_parse() {
     test_parse_null();
+    test_parse_true();
+    test_parse_false();
     test_parse_expect_value();
     test_parse_invalid_value();
     test_parse_root_not_singular();
diff --git a/tutorial02/.cache/clangd/index/leptjson.c.1E269D31D4DDC82F.idx b/tutorial02/.cache/clangd/index/leptjson.c.1E269D31D4DDC82F.idx
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diff --git a/tutorial02/.cache/clangd/index/leptjson.h.3484794EA4220B95.idx b/tutorial02/.cache/clangd/index/leptjson.h.3484794EA4220B95.idx
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diff --git a/tutorial02/.cache/clangd/index/test.c.E013ADDE26D3B5C9.idx b/tutorial02/.cache/clangd/index/test.c.E013ADDE26D3B5C9.idx
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diff --git a/tutorial02/leptjson.c b/tutorial02/leptjson.c
index 7693e43b..6da42e1e 100644
--- a/tutorial02/leptjson.c
+++ b/tutorial02/leptjson.c
@@ -1,8 +1,15 @@
 #include "leptjson.h"
 #include <assert.h>  /* assert() */
+#include <stdio.h>
 #include <stdlib.h>  /* NULL, strtod() */
+#include <string.h>
+/* #include <ctype.h> */
+#include <errno.h>
+#include <math.h>
 
 #define EXPECT(c, ch)       do { assert(*c->json == (ch)); c->json++; } while(0)
+#define ISDIGIT(ch)         ((ch) >= '0' && (ch) <= '9')
+#define ISDIGIT1TO9(ch)     ((ch) >= '1' && (ch) <= '9')
 
 typedef struct {
     const char* json;
@@ -15,7 +22,7 @@ static void lept_parse_whitespace(lept_context* c) {
     c->json = p;
 }
 
-static int lept_parse_true(lept_context* c, lept_value* v) {
+/*static int lept_parse_true(lept_context* c, lept_value* v) {
     EXPECT(c, 't');
     if (c->json[0] != 'r' || c->json[1] != 'u' || c->json[2] != 'e')
         return LEPT_PARSE_INVALID_VALUE;
@@ -40,12 +47,55 @@ static int lept_parse_null(lept_context* c, lept_value* v) {
     c->json += 3;
     v->type = LEPT_NULL;
     return LEPT_PARSE_OK;
+}*/
+
+static int lept_parse_literal(lept_context* c, lept_value* v, const char* target, int type) {
+  int len = strlen(target);
+  int i;
+  /* assert(strlen(c->json) == len); */
+  for (i = 0; i < len; ++i) {
+    if (c->json[i] != target[i]) {
+      return LEPT_PARSE_INVALID_VALUE;
+    }
+  }
+  c->json += len;
+  v->type = type;
+  return LEPT_PARSE_OK;
 }
 
 static int lept_parse_number(lept_context* c, lept_value* v) {
     char* end;
     /* \TODO validate number */
+    /* 1. start with 0-9 or - */
+    int len = strlen(c->json);
+    if (c->json[0] != '-' && !ISDIGIT(c->json[0])) {
+      return LEPT_PARSE_INVALID_VALUE;
+    }
+    /* 2. 0 must be single 0, can't be like 0.0 */
+    if (c->json[0] == '0' && len > 1) {
+      if (c->json[1] != '.') {
+        return LEPT_PARSE_ROOT_NOT_SINGULAR;
+      }
+    }
+    /* 3. there must be some numbers after . */
+    if (len > 1) {
+      int i = 0;
+      for (i = 0; i < len; ++i) {
+        if (c->json[i] == '.') {
+          if (i == len - 1) {
+            return LEPT_PARSE_INVALID_VALUE;
+          } else {
+            break;
+          }
+        }
+      }
+    }
+    errno = 0;
     v->n = strtod(c->json, &end);
+    if (errno == ERANGE && (v->n == HUGE_VAL || v->n == -HUGE_VAL)) {
+      v->type = LEPT_NULL;
+      return LEPT_PARSE_NUMBER_TOO_BIG;
+    }
     if (c->json == end)
         return LEPT_PARSE_INVALID_VALUE;
     c->json = end;
@@ -55,9 +105,14 @@ static int lept_parse_number(lept_context* c, lept_value* v) {
 
 static int lept_parse_value(lept_context* c, lept_value* v) {
     switch (*c->json) {
+        /*
         case 't':  return lept_parse_true(c, v);
         case 'f':  return lept_parse_false(c, v);
         case 'n':  return lept_parse_null(c, v);
+        */
+        case 't': return lept_parse_literal(c, v, "true", LEPT_TRUE);
+        case 'f': return lept_parse_literal(c, v, "false", LEPT_FALSE);
+        case 'n': return lept_parse_literal(c, v, "null", LEPT_NULL);
         default:   return lept_parse_number(c, v);
         case '\0': return LEPT_PARSE_EXPECT_VALUE;
     }
diff --git a/tutorial02/test.c b/tutorial02/test.c
index eaa5db69..78a26d25 100644
--- a/tutorial02/test.c
+++ b/tutorial02/test.c
@@ -70,6 +70,12 @@ static void test_parse_number() {
     TEST_NUMBER(1.234E+10, "1.234E+10");
     TEST_NUMBER(1.234E-10, "1.234E-10");
     TEST_NUMBER(0.0, "1e-10000"); /* must underflow */
+
+    TEST_NUMBER(1.0000000000000002, "1.0000000000000002");
+    TEST_NUMBER(4.9406564584124654e-324, "4.9406564584124654e-324");
+    TEST_NUMBER(2.2250738585072009e-308, "2.2250738585072009e-308");
+    TEST_NUMBER(2.2250738585072014e-308, "2.2250738585072014e-308");
+    TEST_NUMBER(1.7976931348623157e+308, "1.7976931348623157e+308");
 }
 
 #define TEST_ERROR(error, json)\
@@ -89,7 +95,6 @@ static void test_parse_invalid_value() {
     TEST_ERROR(LEPT_PARSE_INVALID_VALUE, "nul");
     TEST_ERROR(LEPT_PARSE_INVALID_VALUE, "?");
 
-#if 0
     /* invalid number */
     TEST_ERROR(LEPT_PARSE_INVALID_VALUE, "+0");
     TEST_ERROR(LEPT_PARSE_INVALID_VALUE, "+1");
@@ -99,25 +104,19 @@ static void test_parse_invalid_value() {
     TEST_ERROR(LEPT_PARSE_INVALID_VALUE, "inf");
     TEST_ERROR(LEPT_PARSE_INVALID_VALUE, "NAN");
     TEST_ERROR(LEPT_PARSE_INVALID_VALUE, "nan");
-#endif
 }
 
 static void test_parse_root_not_singular() {
     TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "null x");
-
-#if 0
     /* invalid number */
     TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "0123"); /* after zero should be '.' , 'E' , 'e' or nothing */
     TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "0x0");
     TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "0x123");
-#endif
 }
 
 static void test_parse_number_too_big() {
-#if 0
     TEST_ERROR(LEPT_PARSE_NUMBER_TOO_BIG, "1e309");
     TEST_ERROR(LEPT_PARSE_NUMBER_TOO_BIG, "-1e309");
-#endif
 }
 
 static void test_parse() {