diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..a39d5a7
--- /dev/null
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,18 @@
+{
+    "configurations": [
+        {
+            "name": "Mac",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "/opt/stow/gctl/include"
+            ],
+            "defines": [],
+            "macFrameworkPath": [],
+            "compilerPath": "/opt/homebrew/bin/gcc-11",
+            "cStandard": "gnu17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "macos-gcc-arm64"
+        }
+    ],
+    "version": 4
+}
\ No newline at end of file
diff --git a/demo.cpp b/demo.cpp
index e85f11c..76677bf 100644
--- a/demo.cpp
+++ b/demo.cpp
@@ -3,34 +3,61 @@
 #include "fstream"
 #include "iomanip"
 
+#include "gctl/utility.h"
+
+#define GRID_FILE   "grid-file|grid_file"
+#define GRID_PARA   "grid-para|grid_para"
+#define MAXI_ERR    "maxi-error|maxi_error"
+#define LOG_FILE    "log-file|log_file"
+#define NEIGH_FILE  "neighbor-file|neighbor_file|neigh-file|neigh_file"
+#define SINGLE_Z    "single-z"
+
 int main(int argc, char const *argv[])
 {
-	// read dem grid
-	std::vector<double> topo(10201);
-
-	std::ifstream infile("topo.txt");
-	for (int i = 0; i < 10201; ++i)
+	if (argc < 2)
 	{
-		infile >> topo[i];
+		std::cerr << "Usage: ./tin <config-file>\n";
+		return -1;
 	}
-	infile.close();
+	
+	gctl::getoption gopt(argv[1]);
+	gopt.show_options();
 
+	// read dem grid
+	double xmin, xmax, ymin, ymax, dx, dy;
+	gctl::parse_string_to_value(gopt.get_value(GRID_PARA), '/', xmin, dx, xmax, ymin, dy, ymax);
+
+	int xnum = round((xmax - xmin)/dx) + 1;
+	int ynum = round((ymax - ymin)/dy) + 1;
+	std::vector<double> topo(xnum*ynum);
+
+	double tmp_d;
+	std::ifstream infile(gopt.get_value(GRID_FILE));
+	if (gopt.get_value(SINGLE_Z, false) != "NullValue")
+	{
+		for (int i = 0; i < xnum*ynum; ++i)
+		{
+			infile >> topo[i];
+		}
+		infile.close();
+	}
+	else
+	{
+		for (int i = 0; i < xnum*ynum; ++i)
+		{
+			infile >> tmp_d >> tmp_d >> topo[i];
+		}
+		infile.close();
+	}
+
+	double maxi_err = std::atof(gopt.get_value(MAXI_ERR).c_str());
 	std::vector<double> err_records;
 	std::vector<vertex2dc*> tin_vert;
 	std::vector<triangle*> tin_ele;
-	dem2tin(topo, 0, 1000, 0, 1000, 10, 10, tin_vert, tin_ele, 1.0, &err_records);
-
-	// Write a log file
-	std::ofstream logfile("topo_TIN.log");
-	logfile << "# Insertion Maxi-Error\n";
-	for (int i = 0; i < err_records.size(); ++i)
-	{
-		logfile << i+1 << " " << err_records[i] << std::endl;
-	}
-	logfile.close();
+	dem2tin(topo, xmin, xmax, ymin, ymax, dx, dy, tin_vert, tin_ele, maxi_err, &err_records);
 
 	// Write a Gmsh's .msh file
-	std::ofstream outfile("topo_TIN.msh");
+	std::ofstream outfile(gopt.get_value(GRID_FILE)+".msh");
 	outfile << "$MeshFormat" << std::endl << "2.2 0 8" << std::endl << "$EndMeshFormat "<<std::endl;
 	outfile << "$Nodes" << std::endl << tin_vert.size() << std::endl;
 	for (int i = 0; i < tin_vert.size(); i++)
@@ -64,22 +91,39 @@ int main(int argc, char const *argv[])
 	outfile.close();
 
 	// write a neighbor file
-	outfile.open("topo_TIN.neigh");
-	outfile << tin_ele.size() << std::endl;
-	for (int i = 0; i < tin_ele.size(); i++)
+	std::string neigh_name = gopt.get_value(NEIGH_FILE, false);
+	if (neigh_name != "NullValue")
 	{
-		outfile << i + 1;
-		for (int j = 0; j < 3; j++)
+		outfile.open(neigh_name+".neigh");
+		outfile << tin_ele.size() << std::endl;
+		for (int i = 0; i < tin_ele.size(); i++)
 		{
-			if (tin_ele[i]->neigh[j] != nullptr)
+			outfile << i + 1;
+			for (int j = 0; j < 3; j++)
 			{
-				outfile << " " << tin_ele[i]->neigh[j]->id + 1;
+				if (tin_ele[i]->neigh[j] != nullptr)
+				{
+					outfile << " " << tin_ele[i]->neigh[j]->id + 1;
+				}
+				else outfile << " -1";
 			}
-			else outfile << " -1";
+			outfile << std::endl;
 		}
-		outfile << std::endl;
+		outfile.close();
+	}
+
+	// Write a log file
+	std::string log_name = gopt.get_value(LOG_FILE, false);
+	if (log_name != "NullValue")
+	{
+		std::ofstream logfile(log_name+".log");
+		logfile << "# Insertion Maxi-Error\n";
+		for (int i = 0; i < err_records.size(); ++i)
+		{
+			logfile << i+1 << " " << err_records[i] << std::endl;
+		}
+		logfile.close();
 	}
-	outfile.close();
 
 	// Destroy memories allocated by the dem2tin function
 	for (int i = 0; i < tin_vert.size(); ++i)
diff --git a/topo_TIN.log b/job.log
similarity index 100%
rename from topo_TIN.log
rename to job.log
diff --git a/job.txt b/job.txt
new file mode 100644
index 0000000..f01fa00
--- /dev/null
+++ b/job.txt
@@ -0,0 +1,6 @@
+grid-file = topo
+grid-para = 0/10/1000/0/10/1000
+maxi-error = 1.0
+log-file = job
+neighbor-file = topo
+single-z = yes
\ No newline at end of file
diff --git a/tin b/tin
new file mode 100755
index 0000000..bf8272c
Binary files /dev/null and b/tin differ
diff --git a/topo.txt b/topo
similarity index 100%
rename from topo.txt
rename to topo
diff --git a/topo_TIN.msh b/topo.msh
similarity index 100%
rename from topo_TIN.msh
rename to topo.msh
diff --git a/topo_TIN.neigh b/topo.neigh
similarity index 100%
rename from topo_TIN.neigh
rename to topo.neigh
diff --git a/topo_TIN.png b/topo_TIN.png
deleted file mode 100644
index 3e9ff9d..0000000
Binary files a/topo_TIN.png and /dev/null differ