Day 5. Organizing into Functions

Although object-oriented programming has shifted attention from functions and toward objects, functions nonetheless remain a central component of any program. Global functions can exist outside of objects and classes, and member functions (sometimes called member methods) exist within a class and do its work.

Today, you will learn

• What a function is and what its parts are

• How to declare and define functions

• How to pass parameters into functions

• How to return a value from a function

You’ll start with global functions today, and tomorrow you’ll see how functions work from within classes and objects as well.

What Is a Function?

A function is, in effect, a subprogram that can act on data and return a value. ...

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