C#: Create a new string of length 2 starting at the given index of a given string

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

Two Characters Starting at Index

Write a C# Sharp program to create a new string of length 2 starting at the given index of a given string.

Visual Presentation:

Sample Solution:-

C# Sharp Code:

using System; // Importing the System namespace

namespace exercises // Define a namespace called 'exercises'
{
    class Program // Define a class named 'Program'
    {
        static void Main(string[] args) // The entry point of the program
        {
            // Output the result of the test function with different strings and integer values as arguments
            Console.WriteLine(test("Hello", 1));   // Pass "Hello" and 1 as arguments to the test function
            Console.WriteLine(test("Python", 2));  // Pass "Python" and 2 as arguments to the test function
            Console.WriteLine(test("on", 1));      // Pass "on" and 1 as arguments to the test function
            Console.ReadLine(); // Wait for user input before closing the console window
        }        

        // Function definition of test function that takes a string 's1' and an integer 'index' and returns a string
        public static string test(string s1, int index)
        {
            // Conditional expression:
            // If index + 2 is less than or equal to the length of 's1', return a substring of 's1' starting from 'index' with a length of 2.
            // Otherwise, return a substring of 's1' starting from index 0 with a length of 2.
            return index + 2 <= s1.Length ? s1.Substring(index, 2) : s1.Substring(0, 2);
        }
    }
}

Sample Output:

el
th
on

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