You’ve learned quite a bit! You now know a bit about how scope works for functions and files, as well as how to make functions more flexible for different use cases:
- Scope is the region of code that has access to an element.
- Globally scoped variables are accessible everywhere.
- A variable created inside a function has local scope and can’t be accessed outside the function.
- C++ functions are usually split to make code more modular:
- The declaration in a header file.
- The definition in another .cpp file.
- Programs with multiple .cpp files need to be linked at compile time:g++ main.cpp fns.cpp
- Header files must be
included in the file with
- You can define a function inline using the
inlinekeyword, which may or may not improve execution speed.
- Default arguments can be added to function declarations so that you can call the function without including those arguments.
- You can overload C++ functions so that they handle different types of input and return different types.
- A function template enables a function to behave the same with different types of parameters.
We’ve provided you with three files to play around with functions:
You can also click on the folder icon and create more files or rename these ones.
Have some fun with functions!