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My bad, I apologise for my initial bump anduril, wont do it again.

First, thank you for your effort esbo; god bless you.

Actually, The code you removed is actually essential for the program to work; since it is the initial position.

Here is my latest code...

I don't really get this. Can you illustrate this in terms of the code? And lets say for 10balls?

Yes. The main solution to make it work is to put the malloc line in the "i" loop. (Why?). And, I also need to improve my code as advised. Thank you, God bless everyone!; Roger and out!

Your comments and help is exponentially building my skills up, Thanks!

Yeah. both .but a blank .txt is created,

Any idea where did i go wrong?

I just want to create a simple code of a moving ball colldiing to each other. I am able to print the results, however, my fprintf isn't working :(. I am quite new to this, so please help? Thank you...