4 / 4

"Well done, Teo! Do you have any questions for me before I let you enter our resistance camp?"
"If you had the same task, how would you solve it? Same as me?"
"Hmm" Almost. I would NOT create a separate variable for the result if I didn't need it. Instead, I would just concatenate the string variables in the output command like this:"

string begin = "All you ";
string middle1 = "need ";
string middle2 = "is ";
string end = "love!";
Console.WriteLine(begin + middle1 + middle2 + end);

"So I can output the result of "+" operation on strings directly?"
"Yes, you can. That's what I've just done."
"And what about outputting the result of the other operations or types? Can I output, say, 24/2 or 12 * 3 or 4-2?"
"Yes, if you don't need to do other things with the numbers. It will look like this:"

Console.WriteLine(24/2);
Console.WriteLine(12*3);
Console.WriteLine(4-2);

"These lines will Output:"

12
36
2

He concluded, "That's enough about strings for now. I'm sure you'll learn more in the future." Then he waved his arm in a gesture showing me I should pass into the underground resistance camp.
I hesitated. "But... Kevin told me that you have something for me. Clothes, chips" you know."
He just repeated his gesture. I decided it would be best to trust and not be a pest, and moved in the direction indicated. There was a hallway that curved so that I couldn't see where it went until I was near the end.

Resistance base

I entered a big facility with multiple rooms, corridors, several levels, etc. There were many people running around and working on their computers. They looked very busy, and nobody paid any attention to me. There was a door with a sign saying "Teo" at the opposite side of the room.
"Strange," I thought, "how long have they been preparing for my arrival?"
I went to the door and opened it. There was a wooden table to the left of the door, with a chair and a little bed in the corner. Minimalistic, but I liked it.
On the table I found a note saying:
 "Dear Teo, welcome to the resistance base! I hope you enjoyed your journey with the program 'Noname' that I created to get you here from the time vortex. Take your time, get some sleep. You have so much more to learn and do! See you tomorrow!"
I lay on the bed, getting drowsy as many different thoughts whirled around in my head. "Noname is just a program? Does that mean I shouldn't return to him? Is all this a lie? How long have I been awake? Or is this all a dream? How long can a person stay awake? Who is stronger: a lion or an elephant?" At some point, the thoughts became dreams, and I was sleeping like a child.