C#: Create a new string from a given string without the first two characters

Last update on June 27 2025 13:09:15 (UTC/GMT +8 hours)

Remove First Two Except 'p' and 'y'

Write a C# Sharp program to create a new string from a given string without the first two characters. Keep the first character if it is "p" and keep the second character if it is "y".

Visual Presentation:

C# Sharp: Basic Algorithm Exercises - Create a new string from a given string without the first 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("abcab")); // Pass "abcab" 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("press")); // Pass "press" to the test function and display the result
            Console.WriteLine(test("jython")); // Pass "jython" 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)
        {
            if (s1.Length >= 2) // If the length of 's1' is greater than or equal to 2
            {
                // If the character at index 1 of 's1' is not equal to "y", remove the character at index 1
                if (String.Compare(s1.Substring(1, 1), "y") != 0)
                {
                    s1 = s1.Remove(1, 1);
                }

                // If the character at index 0 of 's1' is not equal to "p", remove the character at index 0
                if (String.Compare(s1.Substring(0, 1), "p") != 0)
                {
                    s1 = s1.Remove(0, 1);
                }
            }
            else if (s1.Length > 0 && String.Compare(s1.Substring(0, 1), "p") != 0)
            {
                // If 's1' has a length greater than 0 and the character at index 0 is not "p", remove the character at index 0
                s1 = s1.Remove(0, 1);
            }

            return s1; // Return the modified or unchanged 's1'
        }
    }
}

Sample Output:

cab
python
pess
ython

Flowchart:

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