Quote:
I really tried to solved my self
This is not something to solve, the questions are here to test your knowledge.
So the idea is that you study those structures, experimenting with very short pieces of code may help to understand what is doing what.
You have a lot of material available: your lessons, books, tutorials...
You can't learn by having someone studying for you.
You will never win a race by having someone else training for you.
Quote:
I have searched in the internet, it didn't help
You will probably not find direct answers to those questions, because the answers imply that you understand the looping structures.
We do not do your HomeWork.
HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and to help your teacher to check your understanding of the courses you have taken and also the problems you have at applying them.
Any failure of you will help your teacher spot your weaknesses and set remedial actions.