Separating integer values from string

Question

Suppose I've strings like below:

_4_5
_15_16

Now I want them to separate and get the values in variables like

i=4, j=5
i=15, j=16

How it could be done?

Check out String.Split: msdn.microsoft.com/en-us/library/system.string.split.aspx — Bart Friederichs
– Bart Friederichs, Commented May 19, 2014 at 18:44

D Stanley · Accepted Answer · 2014-05-19 18:44:39Z

3

Split the string by underscores and pull out the parts:

string s = "_4_5";
string[] parts = s.Split(new [] {'_'},StringSplitOptions.RemoveEmptyEntries);
i = int.Parse(parts[0]);
j = int.Parse(parts[1]);

Some things to add:

error handling
bounds checking (did I get two parts back?)
number checking using TryParse (are the parts really numbers?)

answered May 19, 2014 at 18:44

D Stanley

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Comments

Icemanind · Accepted Answer · 2014-05-19 19:04:32Z

In addition to D Stanley's answer, if you are going to have an unknown number of variables (in other words, not just i or j), you could use this method:

class Program
{
    static void Main(string[] args)
    {
        string s = "_8_12";

        Console.WriteLine("Original ==> \"{0}\"", s);
        Dictionary<string, int> numbers = ParseNumbers(s);
        PrintNumbers(numbers);
        s = "_1_19_7";
        Console.WriteLine("Original ==> \"{0}\"", s);
        numbers = ParseNumbers(s);
        PrintNumbers(numbers);
    }

    private static Dictionary<string, int> ParseNumbers(string s)
    {
        var variables = new Dictionary<string, int>();
        char startVar = 'i'; // Start at 'i' Variable

        string[] nums = s.Split('_');

        foreach (string num in nums)
        {
            if (string.IsNullOrWhiteSpace(num))
                continue;
            variables.Add(startVar.ToString(CultureInfo.InvariantCulture), int.Parse(num));
            startVar++;
        }
        return variables;
    }

    private static void PrintNumbers(Dictionary<string, int> numbers)
    {
        foreach (var q in numbers)
        {
            Console.WriteLine("{0} ==> {1}", q.Key, q.Value);
        }

        Console.WriteLine();
    }
}

This will allow you to have more than just 2 numbers per input line. So you can pass in strings like _8_12 or _8_12_13_19_25 or even just _8.

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