Tu or vous?

Question

If tu is informal and vous a more formal approach, wouldn't you use Comment vous vous appellez? when asking someone you don't know what their name is? In what situation would you use Comment tu t'appelle? Merci.

Accepted Answer

Yes, talking to an adult you don’t know, you would use the formal vous. 
The informal tu you use with someone you are on very friendly terms, but then you’d know their names of course, or with children. Young adults in an informal setting would also resort to the familiar form among themselves, even if they didn’t know each other.

Answer

Merci beaucoup. Je comprends maintenant. Merci pour la perspicacite.

Answer

You mean comment vous voud appelez not comment vous vous appellez.Thanks