Functions / Methods

A function is a block of code that will run whenever we call it, think of our Main function.

Functions that are part of a class are called methods. In C#, every code file (.cs) must have its code inside a class. Because of this, every function in C# belongs to a class and is, therefore, a method.

We usually use methods to make our code easier to read, organized, reusable, etc.

Working with methods

Methods in C# have several components: - A return type – Specifies what type of value the method returns. - A name (identifier) – The method’s unique name. - A list of parameters (optional) – Inputs that the caller can provide. - A visibility level (access modifier) – Defines where the method can be accessed (e.g., public, private). (Not important for now.)

Void Methods: Methods with a void return type do not return a value, they simply execute their code.

int Add(int a, int b) 
{
    return a + b; // Returns the sum of a and b as an integer type
}

void PrintLine(string sentence) 
{
    Console.WriteLine(sentence); // Prints the provided sentence to the console
}

void PrintLine() 
{
    Console.WriteLine("I got passed 0 arguments."); // No parameters
}

Calling these functions would look something like this:

// When we call functions we pass arguments for the asked parameters.
int a = Add(5, 5);
PrintLine("int a is equal to: " + a);
PrintLine();