C#: Check whether a given string begins with "abc" or "xyz"

Last update on June 27 2025 13:06:26 (UTC/GMT +8 hours)

Starts with 'abc' or 'xyz'

Write a C# Sharp program to check if a given string begins with 'abc' or 'xyz'. If the string begins with 'abc' or 'xyz' return 'abc' or 'xyz' otherwise return an empty string.

visual Presentation:

C# Sharp: Basic Algorithm Exercises - Check whether a given string begins with 'abc' or 'xyz'.

Sample Solution:-

C# Sharp Code:

using System; // Import the System namespace which contains fundamental types and base classes

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
        {
            Console.WriteLine(test("abc")); // Output the result of test function with "abc" as an argument
            Console.WriteLine(test("abcdef")); // Output the result of test function with "abcdef" as an argument
            Console.WriteLine(test("C")); // Output the result of test function with "C" as an argument
            Console.WriteLine(test("xyz")); // Output the result of test function with "xyz" as an argument
            Console.WriteLine(test("xyzsder")); // Output the result of test function with "xyzsder" as an argument
            Console.ReadLine(); // Wait for user input before closing the console window
        }

        // Function definition of test function that takes a string argument 's1' and returns a string
        public static string test(string s1)
        {
            if (s1.StartsWith("abc")) // Check if 's1' starts with "abc"
            {
                return "abc"; // If true, return "abc"
            }
            else if (s1.StartsWith("xyz")) // Check if 's1' starts with "xyz"
            {
                return "xyz"; // If true, return "xyz"
            }
            else
            {
                return String.Empty; // If 's1' doesn't start with "abc" or "xyz", return an empty string
            }
        }
    }
}

Sample Output:

abc
abc

xyz
xyz

Flowchart:

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