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Functions in C#

In this article, we will learn about functions in C#.

Function is a block of code that has a signature. Function is used to execute statements specified in the code block. A function consists of the following components:

  • Function name: It is a unique name that is used to make Function call.
  • Return type: It is used to specify the data type of function return value.
  • Body: It is a block that contains executable statements.
  • Access specifier: It is used to specify function accessibility in the application.
  • Parameters: It is a list of arguments that we can pass to the function during call.

C# Function Syntax

FunctionName()   {  
    // function body  
    // return statement  
}  
</pre>

Access-specifier, parameters and return statement are optional.

Let's see an example in which we have created a function that returns a string value and takes a string parameter.


C# Function: using no parameter and return type

A function that does not return any value specifies void type as a return type. In the following example, a function is created without return type.
using System;
namespace FunctionExample {
    class Program {
        // User defined function without return type  
        public static void Show() // No Parameter  
        {
            Console.WriteLine("This is non parameterized function");
            // No return statement  
        }
        // Main function, execution entry point of the program  
        static void Main(string[] args) {
            Show(); // Calling Function             
        }
    }
}

Output:

This is non parameterized function

C# Function: using parameter but no return type

using System;
namespace FunctionExample {
    class Program {
        // User defined function without return type  
        public static void Show(string message) {
            Console.WriteLine("Hello " + message);
            // No return statement  
        }
        // Main function, execution entry point of the program  
        static void Main(string[] args) {
            Show("Rahul Kumar"); // Calling Function             
        }
    }
}

Output:

Hello Rahul Kumar

C# Function: using parameter and return type

A function can have zero or any number of parameters to get data.
In the following example, a function is created without parameters.
A function without parameter is also known as non-parameterized function.

using System;  
namespace FunctionExample {
    class Program {
        // User defined function  
        public static string Show(string message) {
            Console.WriteLine("Inside Show Function");
            return message;
        }
        // Main function, execution entry point of the program  
        static void Main(string[] args) {
            string message = Show("Rahul Kumar");
            Console.WriteLine("Hello " + message);
        }
    }
}

Output:

Inside Show Function
Hello Rahul Kumar

Task

In the editor below, perform the different tasks as directed.

Create a function name addition which takes two integers as input and returns their sum as output.</p>
Start solving Functions in C# on Interview Code Editor
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