How to get someone's attention and ask for number?

I am too simple, but I am never able to score any numbers or dates 😅.
I want to ask out someone in the library,
I normally sit at the same place from some time there is someone sitting in front of me.
She caught me looking at her and I caught her looking at me.
I just wanna mess up (I don't read any books just some random paper or just try reverse engineer binary for CTF or pwn challenge, for non tech people I am just doing something for computer coding)
Updates
4 mo
False alarm, sorry guys she never was looking at me. It was someone behind me. I think a lot of people have the same spot. She is not single, her boyfriend sits behind me and whenever they share a text she looks at him and smiles.
How to get someone's attention and ask for number?
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