diff --git a/SoftwareDesign/Code/1-2/main.cpp b/SoftwareDesign/Code/1-2/main.cpp
new file mode 100644
index 0000000..7139ad6
--- /dev/null
+++ b/SoftwareDesign/Code/1-2/main.cpp
@@ -0,0 +1,43 @@
+/*
+ * @Author: iR
+ * @Date: 2022-03-12 14:46:07
+ * @LastEditors: iR
+ * @LastEditTime: 2022-03-12 17:13:51
+ * @FilePath: \Code\1-2a\main.cpp
+ * @Description:
+ * @custom_string_iR_Mail: Mail: i@iridium.cyou
+ * @custom_string_iR_copyright: Copyright (c) ${now_year} by iR, All Rights Reserved.
+ */
+
+#include "../inc/matrix.hpp"
+#include <stdio.h>
+
+int main()
+{
+    double data[] = {1, 2, 3, 4, 5, 6};
+    Matrix<double> a(3, 2, data);
+    std::cout << "a" << std::endl
+              << a.at(0, 0) << " " << a.at(1, 0) << a.at(2, 0) << std::endl
+              << a.at(0, 1) << " " << a.at(1, 1) << a.at(2, 2) << std::endl;
+    std::cout << "+=" << std::endl;
+
+    Matrix<double> b(3, 2, data);
+    std::cout << "b" << std::endl
+              << b.at(0, 0) << " " << b.at(1, 0) << b.at(2, 0) << std::endl
+              << b.at(0, 1) << " " << b.at(1, 1) << b.at(2, 2) << std::endl;
+    std::cout << "Answer" << std::endl;
+
+    a += b;
+    std::cout << "a" << std::endl
+              << a.at(0, 0) << " " << a.at(1, 0) << a.at(2, 0) << std::endl
+              << a.at(0, 1) << " " << a.at(1, 1) << a.at(2, 2) << std::endl;
+
+    std::cout << "c=a+b" << std::endl;
+    Matrix<double> c = a + b;
+    std::cout << "Answer" << std::endl;
+    std::cout << "c" << std::endl
+              << c.at(0, 0) << " " << c.at(1, 0) << a.at(2, 0) << std::endl
+              << c.at(0, 1) << " " << c.at(1, 1) << a.at(2, 0) << std::endl;
+
+    return 0;
+}
\ No newline at end of file