...

.
├── src
│   ├── operations.cpp
│   └── operations.h
└── tst
    ├── run_tests.cpp
    └── test_operations.cpp

...

Build the project  -

...

CMake

After the source and test codes code are ready, the project can be built and compiled. At the top of the project's folder structure, add CMakeList. The contents of the file are listed below:

cmake_minimum_required(VERSION 3.16)
project(Calculator)

set(CMAKE_CXX_STANDARD 11)

include_directories(src)
add_subdirectory(src)

enable_testing()
add_subdirectory(tst)