C#: Create a new string from a given string after swapping last two characters

Last update on June 27 2025 13:09:12 (UTC/GMT +8 hours)

Swap Last Two Characters

Write a C# Sharp program to create a new string from a given string after swapping the last two characters.

Visual Presentation:

C# Sharp: Basic Algorithm Exercises - Create a new string from a given string after swapping last two characters.

Sample Solution:-

C# Sharp Code:

using System; // Importing the System namespace

namespace exercises // Defining a namespace called 'exercises'
{
    class Program // Defining a class named 'Program'
    {
        static void Main(string[] args) // The entry point of the program
        {
            // Output the results of the test function with different strings as arguments
            Console.WriteLine(test("Hello")); // Pass "Hello" to the test function and display the result
            Console.WriteLine(test("Python")); // Pass "Python" to the test function and display the result
            Console.WriteLine(test("PHP")); // Pass "PHP" to the test function and display the result
            Console.WriteLine(test("JS")); // Pass "JS" to the test function and display the result
            Console.WriteLine(test("C")); // Pass "C" to the test function and display the result
            Console.ReadLine(); // Wait for user input before closing the console window
        }

        // Function definition of the test function that takes a string 's1' as input and returns a string
        public static string test(string s1)
        {
            // Check if the length of 's1' is greater than 1
            if (s1.Length > 1)
            {
                // If 's1' has a length greater than 1, rearrange the characters and return the modified string
                return s1.Substring(0, s1.Length - 2) + s1[s1.Length - 1] + s1[s1.Length - 2];
            }
            else
            {
                // If 's1' has a length of 1 or less, return 's1' as it is
                return s1;
            }
        }
    }
}

Sample Output:

Helol
Pythno
PPH
SJ
C

Flowchart:

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PREV : Combine Strings Removing Duplicates.
NEXT : Starts with 'abc' or 'xyz'.

C# Sharp Code Editor:

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