CODEWITHSUNDEEP
c#
user7016593
user7016593

Reputation:

How to get an index of a word in string array

I want to get the index of a word in a string array. for example, the sentence I will input is 'I love you.' I have words[1] = love, how can I get the position of 'love' is 1? I could do it but just inside the if state. I want to bring it outside. Please help me. This is my code.

 static void Main(string[] args)
    {
        Console.WriteLine("sentence: ");
        string a = Console.ReadLine();
        String[] words = a.Split(' ');
        List<string> verbs = new List<string>();
        verbs.Add("love");
        int i = 0;
        while (i < words.Length) {
            foreach (string verb in verbs) {
                if (words[i] == verb) {
                    int index = i;
                    Console.WriteLine(i);

                }
            } i++;
        }

        Console.ReadKey();
    }

Upvotes: 0

Views: 3952

Answers (3)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726489

I could do it but just inside the if state. I want to bring it outside.

Your code identifies the index correctly, all you need to do now is storing it for use outside the loop.

Make a list of ints, and call Add on it for the matches that you identify:

var indexes = new List<int>();
while (i < words.Length) {
    foreach (string verb in verbs) {
        if (words[i] == verb) {
            int index = i;
            indexes.Add(i);
            break;
        }
    }
    i++;
}

You can replace the inner loop with a call of Contains method, and the outer loop with a for:

for (var i = 0 ; i != words.Length ; i++) {
    if (verbs.Contains(words[i])) {
        indexes.Add(i);
    }
}

Finally, the whole sequence can be converted to a single LINQ query:

var indexes = words
    .Select((w,i) => new {w,i})
    .Where(p => verbs.Contains(p.w))
    .Select(p => p.i)
    .ToList();

Upvotes: 1

TheQuestioner
TheQuestioner

Reputation: 722

private int GetWordIndex(string WordOrigin, string GetWord)
{
    string[] words = WordOrigin.Split(' ');

    int Index = Array.IndexOf(words, GetWord);

    return Index;
}

assuming that you called the function as GetWordIndex("Hello C# World", "C#");, WordOrigin is Hello C# World and GetWord is C#

now according to the function:

  1. string[] words = WordsOrigin.Split(' '); broke the string literal into an array of strings where the words would be split for every spaces in between them. so Hello C# World would then be broken down into Hello, C#, and World.

  2. int Index = Array.IndexOf(words, GetWord); gets the Index of whatever GetWord is, according to the sample i provided, we are looking for the word C# from Hello C# World that is then splitted into an Array of String

  3. return Index; simply returns whatever index it was located from

Upvotes: 0

Nkosi
Nkosi

Reputation: 247018

Here is an example

var a = "I love you.";
var words = a.Split(' ');
var index = Array.IndexOf(words,"love");
Console.WriteLine(index);

Upvotes: 0

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