How to use the ‘complex’ library in Visual Studio?

To use the complex library in VS, follow these steps:

1. Set up a new C++ project.
2. Import the complex library.
3. In the main function, a complex number object representing 1 + 2i is defined. The real and imaginary parts are then outputted, followed by performing complex number operations on it. The calculated result is displayed before the function returns.
4. Compile and run the program.