Original versus copies

as a default, when you pass any object as an argument, the computer makes a copy of this object so that your original is not used in the function.

This is called "passing by value"

if you like, you can specify that you want the function to use the original object.

This is called "passing by reference"

to receive an argument passed by reference, just precede the parameter name with "&" in the function declaration.

• ex. void jumpjack(athlete &someone) instead of
• void jumpjack(athlete someone)
• no more changes are needed.

example