C#: Create a new string which is 4 copies of the 2 front characters of a given string

Last update on June 25 2025 13:04:11 (UTC/GMT +8 hours)

Four Copies of First Two Characters

Write a C# Sharp program to create a string which is 4 copies of the 2 front characters of a given string. If the given string length is less than 2 return the original string.

Visual Presentation:

C# Sharp: Basic Algorithm Exercises - Create a new string which is 4 copies of the 2 front characters of a given string.

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("C Sharp")); // Output: "C SharpC SharpC SharpC Sharp"
            Console.WriteLine(test("JS"));       // Output: "JSJSJSJS"
            Console.WriteLine(test("a"));        // Output: "aa"
            Console.ReadLine();                  // Keeping the console window open
        }

        // Method to perform a specific string transformation
        public static string test(string str)
        {
            // Conditional check to determine if the length of the input string is less than 2
            // If the length is less than 2, the input string is returned as is
            // If the length is 2 or greater, the string is concatenated multiple times based on its first two characters
            return str.Length < 2
                // If the length is less than 2, returns the input string itself
                ? str
                // If the length is 2 or more, concatenates the first two characters of the input string four times
                : str.Substring(0, 2) + str.Substring(0, 2) + str.Substring(0, 2) + str.Substring(0, 2);
        }
    }
}

Sample Output:

C C C C 
JSJSJSJS
a

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to create 5 copies of the last 3 characters of a string if the length is more than 3.
Write a C# program to repeat the entire string 4 times if it begins with a vowel.
Write a C# program to generate a new string by repeating the first n characters of a string m times.
Write a C# program that appends the first two characters of a string to both ends and repeats it three times.

Go to:

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