Question

How search an array of strings using IndexOf() in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] arr = new string[] { "c#", "c++", "java", "python" };

            int i = Array.IndexOf(arr, "c#");
            Console.WriteLine(i);

            i = Array.IndexOf(arr, "java");
            Console.WriteLine(i);

            i = Array.IndexOf(arr, "r2d2");
            Console.WriteLine(i);
        }
    }
}


/*
run:

0
2
-1

*/

 

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Answer 2

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] arr = new string[] { "c#", "c++", "java", "python" };

            int i = Array.IndexOf(arr, "c#");

            if (i != -1)
                Console.WriteLine("found");
            else
                Console.WriteLine("not found");
        }
    }
}


/*
run:

found

*/

 

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