C#: Create a new string with the last char added at the front and back of a given string of length 1 or more

Last update on June 25 2025 13:04:10 (UTC/GMT +8 hours)

Last Character at Front and Back

Write a C# Sharp program to create a string with the last char added at the front and back of a given string of length 1 or more.

Visual Presentation:

Sample Solution:

C# Sharp Code:

using System;

// Namespace declaration
namespace exercises
{
    // Class declaration
    class Program
    {
        // Main method - entry point of the program
        static void Main(string[] args)
        {
            // Calling the 'test' method with different strings and displaying the returned values
            Console.WriteLine(test("Red"));   // Output: "dRedd"
            Console.WriteLine(test("Green")); // Output: "nGreenn"
            Console.WriteLine(test("1"));     // Output: "11"
            Console.ReadLine();                // Keeping the console window open
        }

        // Method to perform a specific string transformation
        public static string test(string str)
        {
            // Extracts the last character of the input string
            var s = str.Substring(str.Length - 1);

            // Concatenates the last character, the input string, and the last character again
            return s + str + s;
        }
    }
}

Sample Output:

dRedd
nGreenn
111

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C# program to add the second character to the front and back of a string of at least two characters.
• Write a C# program to surround the string with both the first and last characters swapped.
• Write a C# program to repeat the last character at the front and in the middle of the string.
• Write a C# program that surrounds a string with its reversed last three characters.

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