why not working switch statement properly?

Question

https://code.sololearn.com/W6R9G3Sx8069/?ref=app

Answer 1

Because pro is a string so it fails to match a number. Add a parseInt() to convert around the prompt.
var pro = parseInt(prompt("insert a number", 2));

Answer 2

Just a tip:
When your question is solved considering marking the answer which helped you most as best (the tick on the left side of that answer) & if possible, add [Solved] before your question.
That's all, Have a good day. (bye)

https://www.sololearn.com/discuss/345567/?ref=app