Objective type questions in C and simple arithmetic

n technical interview they told me to write a program in C and explain it.

1)Tell me something about yourself.
2)What are your hobbies?
3)Write a C-program to find the factorial of a number.
4)Explain what you have written.
5)What is the significance of the "#inclde<>" sign?

Work on your basics and communication skills.

23 out of 85 were selected.......

I think I got selected for my good kowledge in programming and my confidence and ability.