diff --git a/version1.0/ast.h b/version1.0/ast.h
new file mode 100644
index 0000000..36b51c8
--- /dev/null
+++ b/version1.0/ast.h
@@ -0,0 +1,104 @@
+#ifndef __NASAL_ABSTRACT_SYNTAX_TREE_RUN_H__
+#define __NASAL_ABSTRACT_SYNTAX_TREE_RUN_H__
+
+class abstract_syntax_tree
+{
+	protected:
+		int ast_node_type;
+		std::list<abstract_syntax_tree> statement_list;
+		double var_number;
+		std::string var_string;
+	public:
+		abstract_syntax_tree()
+		{
+			ast_node_type=__root;
+			statement_list.clear();
+			var_number=0;
+			var_string="";
+		}
+		abstract_syntax_tree(const abstract_syntax_tree& temp)
+		{
+			ast_node_type=temp.ast_node_type;
+			statement_list=temp.statement_list;
+			var_number=temp.var_number;
+			var_string=temp.var_string;
+		}
+		void set_node_to_string(std::string& str)
+		{
+			ast_node_type=__string;
+			var_string=str;
+			return;
+		}
+		void set_node_to_number(std::string& str)
+		{
+			ast_node_type=__number;
+			if((int)str.length()>2 && (str[1]=='x' || str[1]=='o'))
+			{
+				if(str[1]=='x')
+				{
+					int num=0;
+					int pw=1;
+					for(int i=(int)str.length()-1;i>1;--i)
+					{
+						if('0'<=str[i] && str[i]<='9')
+							num+=(str[i]-'0')*pw;
+						else if('a'<=str[i] && str[i]<='f')
+							num+=(10+str[i]-'a')*pw;
+						else if('A'<=str[i] && str[i]<='F')
+							num+=(10+str[i]-'A')*pw;
+						pw<<=4;
+					}
+					var_number=(double)num;
+				}
+				else
+				{
+					int num=0;
+					int pw=1;
+					for(int i=(int)str.length()-1;i>1;--i)
+					{
+						num+=(str[i]-'0')*pw;
+						pw<<=3;
+					}
+					var_number=(double)num;
+				}
+				return;
+			}
+			int dot_place=-1;
+			for(int i=0;i<(int)str.length();++i)
+				if(str[i]=='.')
+				{
+					dot_place=i;
+					break;
+				}
+			if(dot_place==-1)
+			{
+				var_number=0;
+				double pw=1;
+				for(int i=(int)str.length()-1;i>=0;--i)
+				{
+					var_number+=(str[i]-'0')*pw;
+					pw*=10;
+				}
+			}
+			else
+			{
+				var_number=0;
+				double pw=0.1;
+				for(int i=dot_place+1;i<(int)str.length();++i)
+				{
+					var_number+=(str[i]-'0')*pw;
+					pw/=10;
+				}
+				pw=1;
+				for(int i=dot_place-1;i>=0;--i)
+				{
+					var_number+=(str[i]-'0')*pw;
+					pw*=10;
+				}
+			}
+			return;
+		}
+};
+
+
+#endif
diff --git a/version1.0/nasal_lexer.h b/version1.0/nasal_lexer.h
index f322274..26f88de 100644
--- a/version1.0/nasal_lexer.h
+++ b/version1.0/nasal_lexer.h
@@ -190,6 +190,11 @@ class nasal_lexer
 						++ptr;
 						temp=source[ptr];
 					}
+					if((int)__token.length()==2)
+					{
+						std::cout<<">>[Lexer-warning] lexer: expect a hex-number string after '0x' ."<<std::endl;
+						__token+="0";
+					}
 				}
 				else if((source[ptr]=='0') && (source[ptr+1]=='o'))
 				{
@@ -203,6 +208,11 @@ class nasal_lexer
 						++ptr;
 						temp=source[ptr];
 					}
+					if((int)__token.length()==2)
+					{
+						std::cout<<">>[Lexer-warning] lexer: expect a oct-number string after '0o' ."<<std::endl;
+						__token+="0";
+					}
 				}
 				else
 				{