--- a/c/regexParser/main.cc	Thu Jun 11 16:24:40 2015 +0900
+++ b/c/regexParser/main.cc	Thu Jun 11 19:50:02 2015 +0900
@@ -10,10 +10,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+
 char *ptr;
-
 typedef struct node {
-    int character;
+    char character;
     struct node *left;
     struct node *right;
 } Node, *NodePtr;
@@ -23,11 +23,10 @@
 NodePtr _or();
 NodePtr asterisk();
 NodePtr regex();
-NodePtr createNode(int,NodePtr,NodePtr);
+NodePtr createNode(char,NodePtr,NodePtr);
 
-NodePtr createNode(int character, NodePtr left, NodePtr right) {
-    NodePtr n;
-    n = (NodePtr)malloc(sizeof(Node));
+NodePtr createNode(char character, NodePtr left, NodePtr right) {
+    NodePtr n = (NodePtr)malloc(sizeof(Node));
     n->character = character;
     n->left = left;
     n->right = right;
@@ -43,13 +42,15 @@
 // <literal> ::= [a-z][A-Z][0-9]
 NodePtr literal() {
     char c = *ptr;
-    createNode(c,0,0);
+    NodePtr n = createNode(c,0,0);
+    ptr++;
+    return n;
 }
 
 // <string> ::= <literal><literal>*
 NodePtr string() {
     char c = *ptr;
-    NodePtr n = (NodePtr)malloc(sizeof(Node));
+    NodePtr n;
 
     if (('a'<=c && c<='z')||('A'<=c && c<='Z')||('0'<=c && c<='9')) {
         n = createNode(0,literal(),string());
@@ -81,15 +82,16 @@
 
     NodePtr n;
 
-    while (int c = *ptr++) {
+    while (char c = *ptr) {
         if (c == '(') {
             ptr++;
-            _or();
+            n = _or();
         } else if (c == '[') {
-            charClass();
+            n = charClass();
         } else {
-            n = createNode(0,string(),regex());
+            n = string();
         }
+        ptr++;
     }
 
     return n;