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Accepted
Juan Pinzón
Asked: 2020-09-11 07:09:44 +0800 CST 2020-09-11 07:09:44 +0800 CST

How to get separate numbers from a string in C#?

  • 772

I have the following string

string a = "24 y 25 de enero";

what I want to do is get the numbers separately, that is {24, 25}

I have tried the following code

string output = new string(a.ToCharArray().Where(c => char.IsDigit(c)).ToArray());

but i get 2425

How could I get those numbers separately?

c#

3 Answers

  1. Best Answer

    If you want it in an array this is the appropriate code:

    in a more elegant way.

    I separate the elements by the spaces in the string and check if the object is a number.

    var a = "24 y 25 de enero";
var array = a.Split(' ').Where(x => int.TryParse(x, out int n));

    This returns us aIEnumerable<string>

    If you occupy an array of <int>you can add the following extension.

    var array = a.Split(' ').Where(x => int.TryParse(x, out int n)).Select(x=>Convert.ToInt32(x));

    And to verify the result in a remarkable and distinguished way:

    Console.WriteLine($"{{{string.Join(",",array)}}}");
    • 4

  2. If the numbers are in the same position you could always try:

    Substring (int startIndex, int length)

    Indicating the starting position and the length of the string you want and then store it in your array.

    • 1

  3. What you have to do is create a method that goes through the string until it finds the letter 'y', in this way, you make a conversion and you get the first number, which would be 24. Then you save it in an auxiliary variable to proceed to get the second number. (25). This is how the method would look:

    class Program
{
    static int GetNumberString(string a, ref int num)
    {
        int i;
        int len = a.Length;
        int aux = 0;
        for(i = 0; i != len; ++i)
        {
            if(a[i] == 'y')
            {
                aux = num;
                num = 0;
            }
            if(a[i] >= '0' && a[i] <= '9')
                num = (num* 10) + (a[i] - '0');
        }
        return aux;
    }

    Method Usage:

        static void Main()
    {
        string a = "24 y 25 de enero";
        int num2 = 0;
        int num1 = GetNumberString(a, ref num2);
        Console.Write("Numero1: " + num1 + " Numero2: " + num2);
        Console.Read();
    }
}
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