C# Creating and using Functions

C# Creating and using Functions

Functions in C# are reusable code blocks that perform a specific task. They can take inputs, process them, and return an output. Here's an example of how to create and use a function in C#:

// Function to add two integers and return the sum int Add(int a, int b) { return a + b; } // Usage of the Add function int result = Add(3, 4); // result is now 7

In the above example, we define a function called Add that takes two integers as inputs and returns their sum. We then call the Add function with the inputs 3 and 4, and store the result in a variable called result.

Here are some key concepts to keep in mind when working with functions in C#:

  • Functions are declared using the function keyword, followed by the function name, input parameters in parentheses, and the function body enclosed in curly braces.
  • The input parameters are separated by commas and include the data type and parameter name.
  • The function body contains the code that performs the task and can include variable declarations, loops, conditionals, and other statements.
  • Functions can return a value using the return keyword followed by the value to be returned. If the function doesn't return a value, its return type is void.
  • Functions can be called by using their name and passing input arguments inside the parentheses.

I hope this helps! Let me know if you have any more questions.

Examples

  1. "C# Create Basic Function"

    public class FunctionExample { public void SimpleFunction() { // Function body Console.WriteLine("Hello, from the SimpleFunction!"); } }

    Description: This code snippet defines a simple function SimpleFunction within a class that prints a message to the console.

  2. "C# Function with Parameters"

    public class FunctionWithParameters { public void FunctionWithParams(string name, int age) { // Function body using parameters Console.WriteLine($"Name: {name}, Age: {age}"); } }

    Description: This code snippet defines a function FunctionWithParams that takes parameters (name and age) and prints them to the console.

  3. "C# Function with Return Value"

    public class FunctionWithReturnValue { public int Add(int a, int b) { // Function body with return value return a + b; } }

    Description: This code snippet defines a function Add that takes two parameters and returns their sum.

  4. "C# Function with Optional Parameters"

    public class FunctionWithOptionalParameters { public void Greet(string name, string greeting = "Hello") { // Function body with optional parameter Console.WriteLine($"{greeting}, {name}!"); } }

    Description: This code snippet defines a function Greet with an optional parameter (greeting) that defaults to "Hello" if not provided.

  5. "C# Lambda Expression"

    public class LambdaExpressionExample { public Func<int, int, int> Add = (a, b) => a + b; }

    Description: This code snippet demonstrates a lambda expression defining an addition function (Add) that takes two parameters and returns their sum.

  6. "C# Function with Variable Number of Arguments"

    public class FunctionWithVariableArguments { public void PrintValues(params int[] values) { // Function body with variable arguments foreach (var value in values) { Console.Write($"{value} "); } Console.WriteLine(); } }

    Description: This code snippet defines a function PrintValues that takes a variable number of integer arguments and prints them to the console.

  7. "C# Function as a Delegate"

    public class FunctionAsDelegate { public delegate int MathOperation(int a, int b); public int Add(int a, int b) { return a + b; } }

    Description: This code snippet defines a delegate (MathOperation) and a function (Add) that matches the delegate's signature.

  8. "C# Recursive Function"

    public class RecursiveFunction { public int Factorial(int n) { // Recursive function return n == 0 ? 1 : n * Factorial(n - 1); } }

    Description: This code snippet defines a recursive function Factorial that calculates the factorial of a number.

  9. "C# Function with Output Parameters"

    public class FunctionWithOutputParameters { public void Divide(int a, int b, out int quotient, out int remainder) { // Function with output parameters quotient = a / b; remainder = a % b; } }

    Description: This code snippet defines a function Divide that takes two parameters and calculates the quotient and remainder using output parameters.

  10. "C# Function with Action Delegate"

    public class FunctionWithActionDelegate { public Action<string> PrintMessage = (message) => { // Function body using Action delegate Console.WriteLine(message); }; }

    Description: This code snippet uses the Action delegate to define a function PrintMessage that takes a string parameter and prints it to the console.

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