How to properly add item to array?

Question

currently I'm trying to add an item to an array using the vector module, but keep getting an error when I try to call the push_back function. could anyone assist?
https://code.sololearn.com/c4DqmUIb4qrv/?ref=app

Answer 1

Fixed:
https://code.sololearn.com/calMtuW4kt6p/?ref=app

Answer 2

https://code.sololearn.com/cMrAo68R3qG8/?ref=app
note: in this example the variable "value" is redundant. you can use x from the for loop

Answer 3

You can use Myaray.at(i); at is part of vector class obj to it anyways