Call by Value and Call by reference

#1

This is in reference to the video Call by value and Call by reference, In the first code shown in this video, Update() is a void function, so I am not understanding how can it return any value to main at all?
( Timestamp in video- 2:34)

#2

HI @anikapassi17_6ce74879d4a8438b, its not returning any value its taking it in a local variable and adding one, see there is no return statement inside