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Method Parameters | Methods
C# Basics
course content

Course Content

C# Basics

C# Basics

1. Getting Started
2. Dealing with Data Types
3. Control Structures
4. Loops
5. Arrays
6. Methods

Method Parameters

Sometimes we need to pass some data into the methods so it can process that data and give us some output. For example, we can create a method that calculates the sum of three numbers and outputs the result. Such a thing can be achieved using method parameters.

We can create a method with parameters using the following syntax:

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static void methodName(dataType parameter1, dataType parameter2, ...) { // Code to be executed }

For-example:

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static void sumOfThree(int a, int b, int c) { int sum = a + b + c; Console.WriteLine($"The sum is {sum}"); }

Note

It's also possible to write expressions directly in string formatting, therefore writing Console.WriteLine($"The sum is {a + b + c}") is also valid in the above case.

In the above code the terms a, b, and c represent the passed data. When we are calling such a method we pass the data along with it. The syntax for executing/calling such a method is the following:

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methodName(argument1, argument2, ...);

For-example:

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sumOfThree(1, 2, 3);

Note

An argument is a value that you pass to a method when calling it, for example 1, 2, and 3 in the above example are arguments. On the other hand, a parameter is a variable declared in the method's definition to receive and work with those arguments. In the above case a, b, and c are the parameters.

Here is the full code for the above example:

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using System; namespace ConsoleApp { internal class Program { static void sumOfThree(int a, int b, int c) { Console.WriteLine($"The sum is {a + b + c}"); } static void Main(string[] args) { sumOfThree(1, 2, 3); } } }

The following illustration explains the flow:

When calling a method, we must always provide the required amount of arguments, otherwise, the code might not compile:

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static void sumOfThree(int a, int b, int c) { int sum = a + b + c; Console.WriteLine($"The sum is {sum}"); } sumOfThree(1, 2); // Error somOfThree(5, 6, 7); // Valid

Apart from that, the order of the arguments must also match the definition of the method. For-example:

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static void exampleMethod(int a, string b, bool c) { Console.WriteLine(a); Console.WriteLine(b); Console.WriteLine(c); } exampleMethod("Hello", 1, true); // Invalid exampleMethod(true, "Hello", 1); // Invalid exampleMethod(1, "Hello", true); // Correct

What is a valid way to call the following method?

Select the correct answer

Everything was clear?

Section 6. Chapter 4
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