diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..7a1b4d7
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.10)
+
+set(CMAKE_CXX_STANDARD 20)
+
+project(Task_2)
+
+add_executable(Task_2 src/main.cpp src/calculator.cpp)
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..e8f2f55
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,13 @@
+all: main
+
+main: main.o calculator.o
+  g++ main.o calculator.o -o main
+
+main.o:
+  g++ -c main.cpp
+
+calculator.o:
+  g++ -c calculator.cpp
+
+clean:
+  rm -rf *.o main
diff --git a/src/calculator.cpp b/src/calculator.cpp
new file mode 100644
index 0000000..516e4f1
--- /dev/null
+++ b/src/calculator.cpp
@@ -0,0 +1,11 @@
+#include "calculator.h"
+
+double Calculator::Add (double a, double b)
+{
+	return a + b;
+}
+
+double Calculator::Sub (double a, double b)
+{
+	return Add (a, -b);
+}
diff --git a/src/calculator.h b/src/calculator.h
new file mode 100644
index 0000000..6fbe608
--- /dev/null
+++ b/src/calculator.h
@@ -0,0 +1,11 @@
+#ifndef CALCULATOR_H
+#define CALCULATOR_H
+
+class Calculator
+{
+	public:
+		double Add (double, double);
+		double Sub (double, double);
+};
+
+#endif//CALCULATOR_H
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..18fca31
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+#include <ostream>
+#include "calculator.h"
+
+int main() {
+    Calculator calculator;
+
+    std::cout << "100.5 + 34.76 = " 
+        << calculator.Add(100.5, 34.76) << "\n"
+        << "235.765 - 24.767 = " << calculator.Sub(235.765, 24.767)
+        << std::endl;
+
+    return 0;
+}
\ No newline at end of file