Lai Alexander

I have recently started to learn how to program with Ruby. I am somewhat familiar with programming already, but by noe means an expert. I really do want to learn programming, so I started off with Ruby. One of my first programs is a program that checks if a number is a prime number. I have made the program in MATLAB earlier, so I just ported it, if one can say that.

Here you see the program in action. My computer have spent the last few hours trying to figure out if it is a prime or not. Yes, I know it is a prime, and therefore the program needs to do a lot more computing. After all, this is actually a quite big number. Even though it is a small program, with just 25 lines of code or so, it uses over 95 % of my CPU. Because of that, my computer is running a bit slow at the moment. Anyway, I will let the computer finish the calculations. I do wonder how much time it will need though.

I will keep you updated, and write a new post when the program gives me the answer. I will give you the code to, if anyone should be interested.

Update: The program have spent the last 22 hours trying to figure out if the number is a prime or not. I’m really beginning to wonder how much time is needed.

Update II: After about 25 hours, I logged in at my computer, and guess what? For some reason, the computer had decided to reboot. Not too happy about that. I actually suspect that the computer got overheated. Anyway, I will try again, but I might try on another computer. After all, the program uses a lot of resources, so I can’t really use the computer while running the program.