Functions: Mad Lib

Every program you’ve seen so far has consisted of one function—main().‌

However, once your programs reach a certain size or level of complexity, it becomes hard to work with them like this. Fortunately, there are ways to break up big programs into smaller, bite-sized chunks of code. In this chapter, you’ll learn about one way—creating new functions. Specifically, you’ll learn to:

n Write new functions

n Accept values into your new functions through parameters

n Return information from your new functions through return values

n Work with global variables and constants

n Overload functions

n Inline functions

Creating Functions Introducing the Instructions Program Declaring Functions Defining Functions Calling Functions Understanding Abstraction Using Parameters and Return Values Introducing the Yes or No Program Returning a Value Accepting Values into Parameters Understanding Encapsulation Understanding Software Reuse Working with Scopes Introducing the Scoping Program Working with Separate Scopes Working with Nested Scopes Using Global Variables Introducing the Global Reach Program Declaring Global Variables Accessing Global Variables Hiding Global Variables Altering Global Variables Minimizing the Use of Global Variables Using Global Constants Using Default Arguments Introducing the Give Me a Number Program Specifying Default Arguments Assigning Default Arguments to Parameters Overriding Default Arguments Overloading Functions Introducing the Triple Program Creating Overloaded Functions Calling Overloaded Functions Inlining Functions Introducing the Taking Damage Program Specifying Functions for Inlining Calling Inlined Functions Introducing the Mad Lib Game Setting Up the Program The main() Function The askText() Function The askNumber() Function The tellStory() Function Summary Questions and Answers Discussion Questions Exercises

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