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diff --git a/doc_example/document_simple.cpp b/doc_example/document_simple.cpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2020 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include <ixion/document.hpp>
+#include <ixion/address.hpp>
+#include <ixion/macros.hpp>
+#include <iostream>
+
+using namespace std;
+
+int main(int argc, char** argv)
+{
+    ixion::document doc;
+    doc.append_sheet("MySheet");
+
+    // Now, populate it with some numeric values in A1:A10.
+    for (ixion::abs_address_t pos(0, 0, 0); pos.row <= 9; ++pos.row)
+    {
+        double value = pos.row + 1.0; // Set the row position + 1 as the cell value.
+        doc.set_numeric_cell(pos, value);
+    }
+
+    // Insert string values.
+    std::string s = "This cell contains a string value.";
+    doc.set_string_cell("B2", s);
+    doc.set_string_cell("B3", "This too contains a string value.");
+
+    doc.set_string_cell("MySheet!B4", "Yet another string value.");
+
+    // Now, let's insert a formula into A11 to sum up values in A1:A10, and calculate it afterward.
+    doc.set_formula_cell("A11", "SUM(A1:A10)");
+    doc.calculate(0);
+
+    double value = doc.get_numeric_value("A11");
+    cout << "value of A11: " << value << endl;
+
+    // Insert a new formula to A11.
+    doc.set_formula_cell("A11", "AVERAGE(A1:A10)");
+    doc.calculate(0);
+
+    value = doc.get_numeric_value("A11");
+    cout << "value of A11: " << value << endl;
+
+    // Overwrite A10 with a formula cell with no references.
+    doc.set_formula_cell("A10", "(100+50)/2");
+    doc.calculate(0);
+
+    value = doc.get_numeric_value("A10");
+    cout << "value of A10: " << value << endl;
+
+    value = doc.get_numeric_value("A11");
+    cout << "value of A11: " << value << endl;
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */