C#: Create a new string from a given string where the first and last characters will change their positions

Last update on June 23 2025 12:59:44 (UTC/GMT +8 hours)

Swap First and Last Characters

Write a C# program to create a new string from a given string where the first and last characters change their positions.

C# Sharp Exercises: Create a new string from a given string where the first and last characters will change their positions

Sample Solution:

C# Sharp Code:

using System;
using System.Collections.Generic;

// This is the beginning of the Exercise16 class
public class Exercise16 {
    // This is the main method where the program execution starts
    static void Main(string[] args)
    {
        // Displaying the result of rearranging the first and last characters of a string
        Console.WriteLine(first_last("w3resource")); // Rearranges the first and last characters of the string
        Console.WriteLine(first_last("Python")); // Rearranges the first and last characters of the string
        Console.WriteLine(first_last("x")); // Returns the same character for a single-character string
    }

    // Function to rearrange the first and last characters of a string
    public static string first_last(string ustr)
    {
        // Using the ternary operator to rearrange characters based on the length of the string
        return ustr.Length > 1
            ? ustr.Substring(ustr.Length - 1) + ustr.Substring(1, ustr.Length - 2) + ustr.Substring(0, 1)
            : ustr; // Returns the same character for a single-character string
    }
}

Test Data: w3resource

Sample Output:

e3resourcw                                                             
nythoP                                                                 
x

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to swap the second and second-last characters of a string.
Write a C# program to swap the first character with the middle character if the string length is odd.
Write a C# program to perform a circular shift of characters: last becomes first, all others shift right.
Write a C# program that swaps first and last characters only if the string length is greater than 3.

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