How to make a console application "return" some text?

Question

C++ / C#

I want to use C++ or C# for this. It is necessary that the application from the command line with certain arguments, in response, returns (to another application) data, some text. Basically, it's a function app. Please name the technology that allows this to be done.
The option to write a dynamic library is not considered (not liked).

Answer 1

You create a process with your application, redirect its stdout to yourself and read the output of this application to your console.