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C++ Functions
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C++ Functions

C++ Functions

1. Introduction
What is Function in C++?How to Create Function in C++?Simple Function CreationVariable ScopesUnderstanding Variable Scopes
2. Function Arguments Specification
Positional and Default ArgumentsPassing Arguments by Value/Pointer/ReferenceConstant Function ArgumentsPassing Static Array as an Argument of the FunctionPassing Dynamic Array as an Argument of the FunctionWhy Do We Need Array Size as an Argument?Passing Custom Structures as Arguments
3. Function Return Values Specification
Returning Values With Simple Data TypesReturning Arrays from the FunctionReturn Custom Data TypesVoid Return Type
4. Some Advanced Topics
Function OverloadingFunction Overloading PracticeRecursionLambda Functions

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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:

cpp

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:

  1. We created calculateFactorial() function that calculates the factorial of the given number and returns it as an output.
  2. 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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