CSharpAlgorithms/Program.cs at master · MccDom1/CSharpAlgorithms · GitHub

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using System;

namespace CSharpAlgorithms
{
    internal class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine("\n===== MENU =====");
                Console.WriteLine("1. Sort Exam Scores (Selection Sort)");
                Console.WriteLine("2. Merge Strings Alternately");
                Console.WriteLine("3. Exit");
                Console.Write("Choose an option: ");

                string choice = Console.ReadLine();

                if (choice == "1")
                {
                    RunSelectionSort();
                }
                else if (choice == "2")
                {
                    RunMergeStrings();
                }
                else if (choice == "3")
                {
                    break;
                }
                else
                {
                    Console.WriteLine("Invalid choice.");
                }
            }
        }


        // PROBLEM 1: Selection Sort

        static void RunSelectionSort()
        {
            Console.Write("\nEnter exam scores separated by spaces: ");
            string input = Console.ReadLine();

            int[] scores = Array.ConvertAll(
                input.Split(' ', StringSplitOptions.RemoveEmptyEntries),
                int.Parse
            );

            SelectionSort(scores);

            Console.WriteLine("Sorted Scores:");
            Console.WriteLine(string.Join(" ", scores));
        }

        static void SelectionSort(int[] arr)
        {
            for (int i = 0; i < arr.Length - 1; i++)
            {
                int minIndex = i;

                for (int j = i + 1; j < arr.Length; j++)
                {
                    if (arr[j] < arr[minIndex])
                        minIndex = j;
                }

                int temp = arr[i];
                arr[i] = arr[minIndex];
                arr[minIndex] = temp;
            }
        }


        // PROBLEM 2: Merge Strings Alternately

        static void RunMergeStrings()
        {
            Console.Write("\nEnter word1: ");
            string word1 = Console.ReadLine();

            Console.Write("Enter word2: ");
            string word2 = Console.ReadLine();

            string merged = MergeAlternately(word1, word2);

            Console.WriteLine("Merged String: " + merged);
        }

        static string MergeAlternately(string word1, string word2)
        {
            int i = 0;
            int j = 0;
            string result = "";

            while (i < word1.Length || j < word2.Length)
            {
                if (i < word1.Length)
                    result += word1[i++];

                if (j < word2.Length)
                    result += word2[j++];
            }

            return result;
        }
    }
}