Need help with some C programming language exercises.

If these are exercises and you wish to learn, then the best way would be to show us how *you* approach it. Because then we will have an opportunity to judge *your* way of thinking and correct you exactly at the point where you are going in the wrong direction.

Looking at other people's code can also be useful to learn something, but there's always the chance it's not correct, or doesn't really teach you anything about the specific topic you wanted to learn about.


Here's a true story:
A very long time a go I tried to coach a girl at school who had severe issues in math. I explained how she should approach the exercises, and she seemed to understand. But when I returned the next week, she had forgotten everything, she couldn't solve the exercises.

Then I went back further and further, to find a base that she still could handle without help. Basically we went back to the lessons she had severeal months ago, before she got sick (she had missed serveal weeks in school). Starting from that point, I was able to teach her the knowledge she had been missing, and this time she didn't forget the lessons.

Today she's an architect.


Tl;dr.:
If you help us understand what your level of knowledge is, then we can build on that to explain what you need to know. If not, you will likely not really understand our explanations, or you will think you understand, only to forget it again shortly.