C#

System.Text.RegularExpressions.Regex.IsMatch(textbox1.Text, "^[A-Za-z ]*$");

gamer1127 wrote:

What programming language that uses CharAt() method?

gamer1127 wrote:

what is the equivalent method of that in C#?

gamer1127 wrote:

CharAt() method? Is that Java?

public static void msd(String[] a)
       {
           msd(a, 0, a.Length, 0);
       }

       private static void msd(String[] a, int l, int r, int d)
       {
           int N = a.Length;

           if (r <== l + 1) return;
           int[] count = new int[256];
           for (int i = 0; i < N; i++)
               count[a[i].charAt(d) + 1]++;
           for (int k = 1; k < 256; k++)
               count[k] += count[k-1];
           for (int i = 0; i < N; i++)
               temp[count[a[i].charAt(d)]++] = a[i];
           for (int i = 0; i < N; i++)
               a[i] = temp[i];
           for (int i = 1; i < 255; i++)
               msd(a, l + count[i], l + count[i+1], d+1);
       }

public static void SortByLastName(ref string[] arrayOfLastNames, ref string[] arrayOfFirstNames, ref string[] arrayOfPlateNum, ref string[] arrayOfType, ref string[] arrayOfYear)
        {
            Console.Clear();

            int vehicleCountInt = 0;
           
            Console.WriteLine("SHOW DATABASE: SORTING BY LAST NAME\n");

            using (StreamReader countVehicle = new StreamReader("vehiclecount.txt"))
            {
                vehicleCountInt = Int32.Parse(countVehicle.ReadLine());
            }

            using (StreamReader outputLastNames = new StreamReader("lastnames.txt"))
            {
                int[] b = new int[vehicleCountInt + 1]; ;

                for (int i = 0; i < vehicleCountInt; i++)
                {
                    arrayOfLastNames[i] = outputLastNames.ReadLine();

                    Console.WriteLine();
                }

            }

            int N = arrayOfLastNames.Length;
            int W = arrayOfLastNames[0].Length;
            string[] temp = new string[vehicleCountInt];

            for (int d = W - 1; d >= 0; d--)
            {
                int[] count = new int[vehicleCountInt];
                for (int i = 0; i < N; i++)
                {
                    count[arrayOfLastNames[i][d] + 1]++;//the part that causes the run-time error
                }
                for (int k = 1; k < 256; k++)
                {
                    count[k] += count[k - 1];
                }
                for (int i = 0; i < N; i++)
                {
                    temp[count[arrayOfLastNames[i][d]]++] = arrayOfLastNames[i];
                }
                for (int i = 0; i < N; i++)
                {
                    arrayOfLastNames[i] = temp[i];

                    Console.WriteLine("{0}", arrayOfLastNames[i]);
                }
            }
        }