C# Sharp Exercises: Check if a given string contains two similar consecutive letters

C# Sharp Basic: Exercise-71 with Solution

Write a C# Sharp program to check if a given string contains two similar consecutive letters.

Sample Solution:

C# Sharp Code:

using System;
namespace exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Original string: PHP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PHP"));
            Console.WriteLine("Original string: PHHP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PHHP"));
            Console.WriteLine("Original string: PHPP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PHPP"));
            Console.WriteLine("Original string: PPHP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PPHP"));
        }
        public static bool test(string text)
        {
            for (int i = 0; i < text.Length - 1; i++)
            {
                if (text[i] == text[i + 1]) 
                    { 
                      return true; 
                    }
            }
            return false;
        }
    }
}

Sample Output:

Original string: PHP
Test for consecutive similar letters! False
Original string: PHHP
Test for consecutive similar letters! True
Original string: PHPP
Test for consecutive similar letters! True
Original string: PPHP
Test for consecutive similar letters! True

Flowchart:

Sample Solution-1:

C# Sharp Code:

using System;
using System.Text.RegularExpressions;
namespace exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Original string: PHP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PHP"));
            Console.WriteLine("Original string: PHHP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PHHP"));
            Console.WriteLine("Original string: PHPP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PHPP"));
            Console.WriteLine("Original string: PPHP");
            Console.WriteLine("Test for consecutive similar letters! " + test("PPHP"));
        }

        public static bool test(string text)
        {
            return Regex.IsMatch(text, @"(.)\1");
        }
     }
}

Sample Output:

Original string: PHP
Test for consecutive similar letters! False
Original string: PHHP
Test for consecutive similar letters! True
Original string: PHPP
Test for consecutive similar letters! True
Original string: PPHP
Test for consecutive similar letters! True

Flowchart:

C# Sharp Code Editor:

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