Task finished

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+set(CMAKE_CXX_STANDARD 20)
+
+project(Task_2)
+
+add_executable(Task_2 src/main.cpp src/calculator.cpp)

src/Makefile

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+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

src/calculator.cpp

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+#include "calculator.h"
+
+double Calculator::Add (double a, double b)
+{
+	return a + b;
+}
+
+double Calculator::Sub (double a, double b)
+{
+	return Add (a, -b);
+}

src/calculator.h

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+#ifndef CALCULATOR_H
+#define CALCULATOR_H
+
+class Calculator
+{
+	public:
+		double Add (double, double);
+		double Sub (double, double);
+};
+
+#endif//CALCULATOR_H

src/main.cpp

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+#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;
+}