Why my new c++ code doesn't working???

Question

it's so sad... 😢

Answer 1

There are multiple errors.
Your main function has no curly bracket (->no body)
cin >> var (instead of cin << var)
the variable num in the for loop needs to be initialised (int num = 0)

What do you want the code to do? It seems a bit odd what's going on there.

Answer 2

https://code.sololearn.com/cqAXEQTr00I5/?ref=app