Function Reverse, Recursive - C# Programming Exercise

In this exercise of C#, you need to create a program that uses recursion to reverse a string of characters. The program should receive a string as input, for example, "Hello", and return it reversed, in this case, "olleH". Recursion is a fundamental technique in C# that allows a function to call itself, which results in an efficient solution for problems like this, where string manipulation is required. This exercise will help you better understand how recursion works in C# and how it can be applied to perform operations on text strings. It’s an excellent example of how to solve string manipulation problems using advanced techniques like recursion, which is key for developing algorithms in C#.

This exercise will not only help you master recursion in C#, but also improve your skills in working with strings and transforming data efficiently and effectively within a program.

 Category

Functions

 Exercise

Function Reverse, Recursive

 Objective

Write a C# program that uses recursion to reverse a string of characters (for example, from "Hello" it would return "olleH").

 Example C# Exercise

 Copy C# Code 
// Import the System namespace to use basic classes like Console
using System;

class Program
{
    // Recursive function to reverse a string
    public static string Reverse(string input)
    {
        // Base case: if the string is empty or has one character, return it as is
        if (input.Length <= 1)
        {
            return input;  // Return the string as is (base case)
        }

        // Recursive case: reverse the rest of the string and append the first character
        return Reverse(input.Substring(1)) + input[0];
    }

    // Main method to test the Reverse function
    public static void Main()
    {
        // Declare a string to be reversed
        string original = "Hello";

        // Call the Reverse function and store the reversed string
        string reversed = Reverse(original);

        // Print the reversed string to the console
        Console.WriteLine($"Original: {original}");  // Expected: Hello
        Console.WriteLine($"Reversed: {reversed}");  // Expected: olleH
    }
}

 Output

Original: Hello
Reversed: olleH

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