C++ Functions

C++ Functions

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1. Introduction

Now it's time to dive into the world of C++ functions! Now you will learn some general concepts about functions in C++, including their definition, declaration, and usage. Discover how to declare and call functions, and gain insights into variable scopes, both local and global, for effective program design.

What is Function in C++?

How to Create Function in C++?

Simple Function Creation

Variable Scopes

Understanding Variable Scopes

2. Function Arguments Specification

We will delve into specifying and using function arguments in C++ programming. Explore concepts like pass-by-value and pass-by-reference, and understand the role of default arguments; learn how to pass arrays as function arguments and become familiar with constant function arguments.

Positional and Default Arguments

Passing Arguments by Value/Pointer/Reference

Constant Function Arguments

Passing Static Array as an Argument of the Function

Passing Dynamic Array as an Argument of the Function

Why Do We Need Array Size as an Argument?

Passing Custom Structures as Arguments

3. Function Return Values Specification

Now we will learn about how to specify the return value of a function in C++. This includes understanding the data types that functions can return, such as integers, floating-point numbers, and arrays. We will also consider function that have no return value.

Returning Values With Simple Data Types

Returning Arrays from the Function

Return Custom Data Types

Void Return Type

4. Some Advanced Topics

Now let's delve into some additional topic in C++! We will explore function overloading, mastering the art of creating multiple functions with the same name but different parameter lists for enhanced code flexibility. Recursion is introduced, teaching the principles of recursive functions, allowing students to solve complex problems efficiently. Additionally, the section covers lambda functions, providing insights into creating concise anonymous functions/

Function Overloading

Function Overloading Practice

Lambda Functions

Зміст курсу

C++ Functions

What is Function in C++?

In C++, a function is a block of code that performs a specific task. You're familiar with this concept and have used it with the main() function, which is special in C++ as it marks the starting point for a program. However, using functions in C++ is not limited to just the main() function. Here's an example:

main


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#include <iostream>

// Function to calculate the factorial of an integer
int calculateFactorial(int n)
{
    int factorial = 1;
    for (int i = 1; i <= n; i++)
        factorial *= i;
    return factorial;
}

int main()
{
    // Call the calculateFactorial function and print the result
    std::cout << calculateFactorial(5) << std::endl;
    std::cout << calculateFactorial(8) << std::endl;
}

Let's clarify what was done in the code above:

We created calculateFactorial() function that calculates the factorial of the given number and returns it as an output.
We called this function in our program's main() function and printed the result into the console.

You might not get what happened yet – like how we made the function, what stuff we put into it, and what's inside the code. But don't worry, we'll explain it all soon.

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