Method overloading and method over ridong

Answer 1

https://www.sololearn.com/Discuss/362246/?ref=app

Answer 2

The override keyword is just a hint to the compiler telling that a function is overriding another in a base class, so there exists a function in the base class which must be overrided, and if it is not, a compile time error is thrown.

Here a piece of code that may help you:
https://code.sololearn.com/cCbidD3S0VjY/?ref=app