Explore C++ from scratch; gain insights into core concepts like loops, functions, and advanced topics such as inheritance and templates to become an intermediate-level C++ developer.

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Learn C++ for free with this interactive course, and get a handle on one of the most popular programming languages in the world.

You'll start with a simple hello world program and proceed to cover core concepts such as conditional statements, loops, and functions in C++, before moving on to more advanced topics like inheritance, classes, and templates, along with much more.

By the time you're done, you'll be an intermediate level C++ developer, ready to take on your own projects.

Learn C++ from Scratch

# Declaration of Function in C++
Before we discuss *calling* functions, we must talk about *declarations*. Programs written in C++ are executed in logical order from the top down. A statement can only use *symbols*, or named constructs like *functions*, that are declared in code that has already been executed. Simply put; the compiler must be aware of the name used to describe a function before that function can be called in the code.

For example, to allow `main` to call functions that are defined after the `main` function itself in the code, we use **forward declarations**. A *forward* declaration tells the compiler that a function exists and what its *arguments* look like, but the *definition* of the function will be elsewhere.

The *declaration* begins much the same as the *definition*.

Introduction

Variables & User Input

Simple Maths

Conditional Statements

Loops

Functions and Recursion

C++ Exam 1

Pointers & Arrays

C++ Exam 2

Classes and Inheritance

Templates

C++ Exam 3

Function Declarations

Declaration of Function in C++