diff --git a/native/jni/src/char_utils.cpp b/native/jni/src/char_utils.cpp
index d0547a9..9d27cad 100644
--- a/native/jni/src/char_utils.cpp
+++ b/native/jni/src/char_utils.cpp
@@ -17,6 +17,7 @@
 #include <cstdlib>
 
 #include "char_utils.h"
+#include "defines.h"
 
 namespace latinime {
 
@@ -33,7 +34,7 @@
 //
 //    unsigned short c, cc, ccc, ccc2;
 //    for (c = 0; c < 0xFFFF ; c++) {
-//        if (c < sizeof(BASE_CHARS) / sizeof(BASE_CHARS[0])) {
+//        if (c < NELEMS(BASE_CHARS)) {
 //            cc = BASE_CHARS[c];
 //        } else {
 //            cc = c;
@@ -894,9 +895,7 @@
 unsigned short latin_tolower(const unsigned short c) {
     struct LatinCapitalSmallPair *p =
             static_cast<struct LatinCapitalSmallPair *>(bsearch(&c, SORTED_CHAR_MAP,
-                    sizeof(SORTED_CHAR_MAP) / sizeof(SORTED_CHAR_MAP[0]),
-                    sizeof(SORTED_CHAR_MAP[0]),
-                    compare_pair_capital));
+                    NELEMS(SORTED_CHAR_MAP), sizeof(SORTED_CHAR_MAP[0]), compare_pair_capital));
     return p ? p->small : c;
 }
 } // namespace latinime
diff --git a/native/jni/src/correction.cpp b/native/jni/src/correction.cpp
index 524abe9..d57b0e3 100644
--- a/native/jni/src/correction.cpp
+++ b/native/jni/src/correction.cpp
@@ -1118,7 +1118,7 @@
     const int distance = editDistance(before, beforeLength, after, afterLength);
     int spaceCount = 0;
     for (int i = 0; i < afterLength; ++i) {
-        if (after[i] == CODE_SPACE) {
+        if (after[i] == KEYCODE_SPACE) {
             ++spaceCount;
         }
     }
diff --git a/native/jni/src/correction.h b/native/jni/src/correction.h
index f016d54..a099853 100644
--- a/native/jni/src/correction.h
+++ b/native/jni/src/correction.h
@@ -116,7 +116,6 @@
         static int editDistance(const unsigned short *before,
                 const int beforeLength, const unsigned short *after, const int afterLength);
      private:
-        static const int CODE_SPACE = ' ';
         static const int MAX_INITIAL_SCORE = 255;
     };
 
diff --git a/native/jni/src/defines.h b/native/jni/src/defines.h
index ea0f0ef..1bb0313 100644
--- a/native/jni/src/defines.h
+++ b/native/jni/src/defines.h
@@ -344,8 +344,8 @@
 #define MULTIPLE_WORDS_DEMOTION_RATE 80
 #define MIN_INPUT_LENGTH_FOR_THREE_OR_MORE_WORDS_CORRECTION 6
 
-#define TWO_WORDS_CORRECTION_WITH_OTHER_ERROR_THRESHOLD 0.35
-#define START_TWO_WORDS_CORRECTION_THRESHOLD 0.185
+#define TWO_WORDS_CORRECTION_WITH_OTHER_ERROR_THRESHOLD 0.35f
+#define START_TWO_WORDS_CORRECTION_THRESHOLD 0.185f
 /* heuristic... This should be changed if we change the unit of the frequency. */
 #define SUPPRESS_SHORT_MULTIPLE_WORDS_THRESHOLD_FREQ (MAX_FREQ * 58 / 100)
 
@@ -392,6 +392,8 @@
 template<typename T> inline T min(T a, T b) { return a < b ? a : b; }
 template<typename T> inline T max(T a, T b) { return a > b ? a : b; }
 
+#define NELEMS(x) (sizeof(x) / sizeof((x)[0]))
+
 // The ratio of neutral area radius to sweet spot radius.
 #define NEUTRAL_AREA_RADIUS_RATIO 1.3f
 
diff --git a/native/jni/src/dictionary.cpp b/native/jni/src/dictionary.cpp
index 2fbe83e..81789cc 100644
--- a/native/jni/src/dictionary.cpp
+++ b/native/jni/src/dictionary.cpp
@@ -30,13 +30,12 @@
 
 // TODO: Change the type of all keyCodes to uint32_t
 Dictionary::Dictionary(void *dict, int dictSize, int mmapFd, int dictBufAdjust,
-        int typedLetterMultiplier, int fullWordMultiplier, int maxWordLength, int maxWords,
-        int maxPredictions)
+        int fullWordMultiplier, int maxWordLength, int maxWords, int maxPredictions)
         : mDict(static_cast<unsigned char *>(dict)),
           mOffsetDict((static_cast<unsigned char *>(dict)) + BinaryFormat::getHeaderSize(mDict)),
           mDictSize(dictSize), mMmapFd(mmapFd), mDictBufAdjust(dictBufAdjust),
-          mUnigramDictionary(new UnigramDictionary(mOffsetDict, typedLetterMultiplier,
-                  fullWordMultiplier, maxWordLength, maxWords, BinaryFormat::getFlags(mDict))),
+          mUnigramDictionary(new UnigramDictionary(mOffsetDict, fullWordMultiplier, maxWordLength,
+                  maxWords, BinaryFormat::getFlags(mDict))),
           mBigramDictionary(new BigramDictionary(mOffsetDict, maxWordLength, maxPredictions)),
           mGestureDecoder(new GestureDecoderWrapper(maxWordLength, maxWords)) {
     if (DEBUG_DICT) {
diff --git a/native/jni/src/dictionary.h b/native/jni/src/dictionary.h
index a135889..120ca5f 100644
--- a/native/jni/src/dictionary.h
+++ b/native/jni/src/dictionary.h
@@ -41,8 +41,8 @@
     const static int KIND_SHORTCUT = 7; // A shortcut
     const static int KIND_PREDICTION = 8; // A prediction (== a suggestion with no input)
 
-    Dictionary(void *dict, int dictSize, int mmapFd, int dictBufAdjust, int typedLetterMultipler,
-            int fullWordMultiplier, int maxWordLength, int maxWords, int maxPredictions);
+    Dictionary(void *dict, int dictSize, int mmapFd, int dictBufAdjust, int fullWordMultiplier,
+            int maxWordLength, int maxWords, int maxPredictions);
 
     int getSuggestions(ProximityInfo *proximityInfo, void *traverseSession, int *xcoordinates,
             int *ycoordinates, int *times, int *pointerIds, int *codes, int codesSize,
diff --git a/native/jni/src/proximity_info_state.cpp b/native/jni/src/proximity_info_state.cpp
index 392ec81..0151743 100644
--- a/native/jni/src/proximity_info_state.cpp
+++ b/native/jni/src/proximity_info_state.cpp
@@ -518,7 +518,7 @@
 }
 
 int ProximityInfoState::getSpaceY() const {
-    const int keyId = mProximityInfo->getKeyIndexOf(' ');
+    const int keyId = mProximityInfo->getKeyIndexOf(KEYCODE_SPACE);
     return mProximityInfo->getKeyCenterYOfKeyIdG(keyId);
 }
 
diff --git a/native/jni/src/unigram_dictionary.cpp b/native/jni/src/unigram_dictionary.cpp
index 49d044f..3b485a0 100644
--- a/native/jni/src/unigram_dictionary.cpp
+++ b/native/jni/src/unigram_dictionary.cpp
@@ -41,14 +41,12 @@
         { 'o', 'e', 0x0153 } }; // U+0153 : LATIN SMALL LIGATURE OE
 
 // TODO: check the header
-UnigramDictionary::UnigramDictionary(const uint8_t *const streamStart, int typedLetterMultiplier,
-        int fullWordMultiplier, int maxWordLength, int maxWords, const unsigned int flags)
-    : DICT_ROOT(streamStart), MAX_WORD_LENGTH(maxWordLength), MAX_WORDS(maxWords),
-    TYPED_LETTER_MULTIPLIER(typedLetterMultiplier), FULL_WORD_MULTIPLIER(fullWordMultiplier),
-      // TODO : remove this variable.
-    ROOT_POS(0),
-    BYTES_IN_ONE_CHAR(sizeof(int)),
-    MAX_DIGRAPH_SEARCH_DEPTH(DEFAULT_MAX_DIGRAPH_SEARCH_DEPTH), FLAGS(flags) {
+UnigramDictionary::UnigramDictionary(const uint8_t *const streamStart, int fullWordMultiplier,
+        int maxWordLength, int maxWords, const unsigned int flags)
+        : DICT_ROOT(streamStart), MAX_WORD_LENGTH(maxWordLength), MAX_WORDS(maxWords),
+          FULL_WORD_MULTIPLIER(fullWordMultiplier), // TODO : remove this variable.
+          ROOT_POS(0), BYTES_IN_ONE_CHAR(sizeof(int)),
+          MAX_DIGRAPH_SEARCH_DEPTH(DEFAULT_MAX_DIGRAPH_SEARCH_DEPTH), FLAGS(flags) {
     if (DEBUG_DICT) {
         AKLOGI("UnigramDictionary - constructor");
     }
@@ -188,8 +186,7 @@
         getWordWithDigraphSuggestionsRec(proximityInfo, xcoordinates, ycoordinates, codesBuffer,
                 xCoordinatesBuffer, yCoordinatesBuffer, codesSize, bigramMap, bigramFilter,
                 useFullEditDistance, codes, codesSize, 0, codesBuffer, &masterCorrection,
-                &queuePool, GERMAN_UMLAUT_DIGRAPHS,
-                sizeof(GERMAN_UMLAUT_DIGRAPHS) / sizeof(GERMAN_UMLAUT_DIGRAPHS[0]));
+                &queuePool, GERMAN_UMLAUT_DIGRAPHS, NELEMS(GERMAN_UMLAUT_DIGRAPHS));
     } else if (BinaryFormat::REQUIRES_FRENCH_LIGATURES_PROCESSING & FLAGS) {
         int codesBuffer[getCodesBufferSize(codes, codesSize)];
         int xCoordinatesBuffer[codesSize];
@@ -197,8 +194,7 @@
         getWordWithDigraphSuggestionsRec(proximityInfo, xcoordinates, ycoordinates, codesBuffer,
                 xCoordinatesBuffer, yCoordinatesBuffer, codesSize, bigramMap, bigramFilter,
                 useFullEditDistance, codes, codesSize, 0, codesBuffer, &masterCorrection,
-                &queuePool, FRENCH_LIGATURES_DIGRAPHS,
-                sizeof(FRENCH_LIGATURES_DIGRAPHS) / sizeof(FRENCH_LIGATURES_DIGRAPHS[0]));
+                &queuePool, FRENCH_LIGATURES_DIGRAPHS, NELEMS(FRENCH_LIGATURES_DIGRAPHS));
     } else { // Normal processing
         getWordSuggestions(proximityInfo, xcoordinates, ycoordinates, codes, codesSize,
                 bigramMap, bigramFilter, useFullEditDistance, &masterCorrection, &queuePool);
@@ -314,8 +310,6 @@
     correction->initCorrection(proximityInfo, inputSize, maxDepth);
 }
 
-static const char SPACE = ' ';
-
 void UnigramDictionary::getOneWordSuggestions(ProximityInfo *proximityInfo,
         const int *xcoordinates, const int *ycoordinates, const int *codes,
         const std::map<int, int> *bigramMap, const uint8_t *bigramFilter,
@@ -570,7 +564,7 @@
         if (outputWordStartPos + nextWordLength >= MAX_WORD_LENGTH) {
             return FLAG_MULTIPLE_SUGGEST_SKIP;
         }
-        outputWord[tempOutputWordLength] = SPACE;
+        outputWord[tempOutputWordLength] = KEYCODE_SPACE;
         if (outputWordLength) {
             ++*outputWordLength;
         }
diff --git a/native/jni/src/unigram_dictionary.h b/native/jni/src/unigram_dictionary.h
index 57129bb..244d78d 100644
--- a/native/jni/src/unigram_dictionary.h
+++ b/native/jni/src/unigram_dictionary.h
@@ -39,8 +39,8 @@
     static const int FLAG_MULTIPLE_SUGGEST_ABORT = 0;
     static const int FLAG_MULTIPLE_SUGGEST_SKIP = 1;
     static const int FLAG_MULTIPLE_SUGGEST_CONTINUE = 2;
-    UnigramDictionary(const uint8_t *const streamStart, int typedLetterMultipler,
-            int fullWordMultiplier, int maxWordLength, int maxWords, const unsigned int flags);
+    UnigramDictionary(const uint8_t *const streamStart, int fullWordMultiplier, int maxWordLength,
+            int maxWords, const unsigned int flags);
     int getFrequency(const int32_t *const inWord, const int length) const;
     int getBigramPosition(int pos, unsigned short *word, int offset, int length) const;
     int getSuggestions(ProximityInfo *proximityInfo, const int *xcoordinates,
@@ -115,7 +115,6 @@
     const uint8_t *const DICT_ROOT;
     const int MAX_WORD_LENGTH;
     const int MAX_WORDS;
-    const int TYPED_LETTER_MULTIPLIER;
     const int FULL_WORD_MULTIPLIER;
     const int ROOT_POS;
     const unsigned int BYTES_IN_ONE_CHAR;