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C# Basics

bookMethod 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:

main.cs

main.cs

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

Here is the usage of the parameters:

main.cs

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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:

main.cs

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1

            
methodName(argument1, argument2, ...);

For example:

main.cs

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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:

main.cs

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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:

main.cs

main.cs

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using System;

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

        static void Main(string[] args)
        {
            //sumOfThree(1, 2); // Error
            sumOfThree(5, 6, 7); // Valid
        }
    }
}

Note

In the code above, line sumOfThree(1, 2) will throw an error, because there are only 2 arguments provided. Required 3.

Apart from that, the order of the arguments must also match the definition of the method:

main.cs

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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
question mark

What is a valid way to call the following method?

Select the correct answer

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How can we improve it?

Thanks for your feedback!

SectionΒ 6. ChapterΒ 4

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bookMethod Parameters

Swipe to show menu

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:

main.cs

main.cs

copy

              
1234

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

Here is the usage of the parameters:

main.cs

main.cs

copy

              
12345

            
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:

main.cs

main.cs

copy

              
1

            
methodName(argument1, argument2, ...);

For example:

main.cs

main.cs

copy

              
1

            
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:

main.cs

main.cs

copy

              
1234567891011121314151617

            
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:

main.cs

main.cs

copy

              
12345678910111213141516171819

            
using System;

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

        static void Main(string[] args)
        {
            //sumOfThree(1, 2); // Error
            sumOfThree(5, 6, 7); // Valid
        }
    }
}

Note

In the code above, line sumOfThree(1, 2) will throw an error, because there are only 2 arguments provided. Required 3.

Apart from that, the order of the arguments must also match the definition of the method:

main.cs

main.cs

copy

              
123456789

            
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
question mark

What is a valid way to call the following method?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 6. ChapterΒ 4
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