Fix 'Complex Method' issue in ConsoleApplication1.cpp

[CodeFactor](https://www.codefactor.io/repository/github/skyec-data/operator-and-stack) found an issue: Complex Method

It's currently on:
[ConsoleApplication1.cpp:49-111](https://www.codefactor.io/repository/github/skyec-data/operator-and-stack/source/master/ConsoleApplication1.cpp#L49)
Commit 42332f82262222e5bbecab337857d3b52db21a5f