Should I tell my crush I like him or just ask him out?

I was thinking of casually saying "hey, I like you" while walking in the hall with him, but I don't know if that's best. I can't tell if he likes me too or not, but I know that if he doesn't, it would help me move on. Maybe I should ask him if he's going to home coming or just ask him to go to homecoming with me? I'm not sure if I should just tell him I like him, or instead just ask him out.
Should I tell my crush I like him or just ask him out?
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