diff --git a/nodes/CStatementNode.cc b/nodes/CStatementNode.cc
new file mode 100644
index 0000000..9ce67c3
--- /dev/null
+++ b/nodes/CStatementNode.cc
@@ -0,0 +1,12 @@
+
+#include <stdio.h>
+#include <string>
+#include "Node.h"
+#include "util/refptr.h"
+using namespace std;
+
+void CStatementNode::process(FILE * out)
+{
+    fprintf(out, "%s", m_string.c_str());
+    fprintf(out, "\n");
+}
diff --git a/nodes/Node.cc b/nodes/Node.cc
index c4f5e9e..9ea6bd3 100644
--- a/nodes/Node.cc
+++ b/nodes/Node.cc
@@ -1,6 +1,6 @@
 
-#include "Node.h"
 #include <vector>
+#include "Node.h"
 #include "util/refptr.h"
 using namespace std;
 
diff --git a/nodes/Node.h b/nodes/Node.h
index 376cf0e..18c3022 100644
--- a/nodes/Node.h
+++ b/nodes/Node.h
@@ -2,6 +2,7 @@
 #ifndef NODE_H
 #define NODE_H NODE_H
 
+#include <stdio.h>
 #include <stdint.h>
 #include <vector>
 #include <string>
@@ -15,31 +16,52 @@ class Node
         void addChildren(refptr<Node> other);
         std::vector< refptr<Node> > & getChildren() { return m_children; }
 
-        virtual uint64_t getInteger() { return 0x0ULL; }
-        virtual std::string getString() { return ""; }
+        virtual double getDouble() { return m_double; }
+        virtual uint64_t getInteger() { return m_integer; }
+        virtual std::string getString() { return m_string; }
         virtual void process(FILE * out) { }
 
     protected:
         std::vector< refptr<Node> > m_children;
+        uint64_t m_integer;
+        std::string m_string;
+        double m_double;
 };
 
 
+class CStatementNode : public Node
+{
+    public:
+        CStatementNode(const std::string & str) { m_string = str; }
+        virtual void process(FILE * out);
+};
+
+class DoubleNode : public Node
+{
+    public:
+        DoubleNode(double val) { m_double = val; }
+};
+
+class IdentifierNode : public Node
+{
+    public:
+        IdentifierNode(const std::string & str) { m_string = str; }
+};
+
 class IntegerNode : public Node
 {
     public:
         IntegerNode(uint64_t integer) { m_integer = integer; }
-        unsigned long getInteger() { return m_integer; }
-    protected:
-        uint64_t m_integer;
+};
+
+class ProgramNode : public Node
+{
 };
 
 class StringNode : public Node
 {
     public:
         StringNode(const std::string & str) { m_string = str; }
-        std::string getString() { return m_string; }
-    protected:
-        std::string m_string;
 };
 
 #endif
diff --git a/parser/parser.lex b/parser/parser.lex
index b5f68d6..d671b91 100644
--- a/parser/parser.lex
+++ b/parser/parser.lex
@@ -4,12 +4,31 @@
 
 %{
 
+#include <stdint.h>
+#include <string>
 #include "parser.h"
 #include "parser.tab.hh"
-#include <string>
 using namespace std;
 static string build_string;
 
+static uint64_t parseInt(const char * text, int base)
+{
+    uint64_t val = 0;
+    for (const char * p = text; *p != '\0'; p++)
+    {
+        int digit = -1;
+        if      (*p >= '0' && *p <= '9')    digit = *p - '0';
+        else if (*p >= 'A' && *p <= 'Z')    digit = *p - 'A';
+        else if (*p >= 'a' && *p <= 'z')    digit = *p - 'a';
+        if (digit != -1)
+        {
+            val *= base;
+            val += digit;
+        }
+    }
+    return val;
+}
+
 %}
 
 %x str
@@ -47,17 +66,23 @@ static string build_string;
 \(      return LPAREN;
 \)      return RPAREN;
 
-    /* literals */
-[0-9]+ {
+    /* numeric literals */
+[0-9][0-9_]* {
+        *yylval = new IntegerNode(parseInt(yytext, 10));
         return INT_LITERAL;
 }
-0x[0-9A-Fa-f]+ {
+0x[0-9A-Fa-f][0-9A-Fa-f_]* {
+        *yylval = new IntegerNode(parseInt(yytext + 2, 16));
         return INT_LITERAL;
 }
-0b[01]+ {
+0b[01][01_]* {
+        *yylval = new IntegerNode(parseInt(yytext + 2, 2));
         return INT_LITERAL;
 }
 [0-9]*\.[0-9]+([eE]-?[0-9]+)? {
+        double val;
+        (void) sscanf(yytext, "%lf", &val);
+        *yylval = new DoubleNode(val);
         return REAL_LITERAL;
 }
 
@@ -84,6 +109,7 @@ struct      return STRUCT;
 
     /* identifiers */
 [a-zA-Z_][a-zA-Z_0-9]* {
+            *yylval = new IdentifierNode(yytext);
             return IDENTIFIER;
 }
 
diff --git a/parser/parser.yy b/parser/parser.yy
index 44d7512..b9cb775 100644
--- a/parser/parser.yy
+++ b/parser/parser.yy
@@ -91,7 +91,9 @@ static YYSTYPE parse_result;
 %%
 
 program: program_items {
-        }
+        $$ = new ProgramNode();
+        $$->addChildren($1);
+       }
        ;
 
 program_items: /* empty */
@@ -187,7 +189,9 @@ type: primitive_type
 
 statement: expression SEMICOLON
          | return_statement
-         | c_statement
+         | c_statement {
+            $$ = $1;
+         }
          ;
 
 return_statement: RETURN expression SEMICOLON
@@ -204,8 +208,8 @@ lvalue: IDENTIFIER
       ;
 
 c_statement: C LPAREN STRING_LITERAL RPAREN SEMICOLON {
-                printf("c_statement: '%s'\n", $3->getString().c_str());
-            }
+                $$ = new CStatementNode($3->getString());
+           }
            ;
 
 %%