Need help on finding if a value it is in Array range

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I'm doing some exams about web services.
I create a web service that it has to do with arrays, like finding non zero values, positive, negative, members between two given values etc.
The problem is that I don't know how to find if a given value is in range of a given array.

Here is some code I made in web service and in a costumer of the service.

Web service app.

C#

public class Service1 : System.Web.Services.WebService
    {

        [WebMethod]
       //non zero members
        public List<int> AnetaretJoZero(int [] anetaret)
        {
            var lista = new List<int>();
            for (int i = 0; i < anetaret.Length; i++)
            {
                if (anetaret[i] != 0)
                {
                    lista.Add(anetaret[i]);
                }
            }
            return lista;
           
        }

        [WebMethod]
        //negative members
        public List<int> AnetaretNegativ(int[] negativ)
        {
            var list_negativ = new List<int>();
            for (int i = 0; i < negativ.Length; i++)
            {
                if (negativ[i] < 0)
                {
                    list_negativ.Add(negativ[i]);
                }
            }
            return list_negativ;
        }
        [WebMethod]
        //positive members
        public List<int> AnetaretPozitiv(int[] pozitiv)
        {
            var list_pozitiv = new List<int>();
            for (int i = 0; i < pozitiv.Length; i++)
            {
                if (pozitiv[i] > 0)
                {
                    list_pozitiv.Add(pozitiv[i]);
                }
            }
            return list_pozitiv;
        }
        [WebMethod]
        //members between two given values
        public List<int> AnetaretMesVlerave(int[] mesvlera, int a, int b)
        {
            var list_mesvlera = new List<int>();
            for (int i = 0; i < mesvlera.Length; i++)
            {
                if (mesvlera[i]>=a & mesvlera[i]<=b)
                {
                    list_mesvlera.Add(mesvlera[i]); 
                }
            }
            return list_mesvlera;
        }
// here I'm attempting to do some code about my problem to
//find if the given value is in range of a given array

        }

The consumer code app

C#

static void Main(string[] args)
        {
           //this is a consumer array
            int[] vek = { -3, 1, 0, 2,-5, -25, 0, 5, 6, 12, 45, 0 };
            referenca.Service1 sherbimi = new referenca.Service1();
            //vek = sherbimi.Vektori(vek);
            int[] resVek = sherbimi.AnetaretJoZero(vek);
            
            //non zero values of the array
            Console.WriteLine("Anetaret jo zero të vektorit janë: ");
            Console.WriteLine();
            for (int i = 0; i < resVek.Length; i++)
            {
                Console.Write(resVek[i] + ", ");
            }
            
            //negative member of array
            int[] vekrez = sherbimi.AnetaretNegativ(vek);
            Console.WriteLine();
            Console.WriteLine("Anetaret negativ të vektorit janë: ");
            Console.WriteLine();
            for (int j = 0; j < vekrez.Length; j++)
            {
                Console.Write(vekrez[j] + ", ");
                
            }

             //positive member of array
            int[] vekpoz = sherbimi.AnetaretPozitiv(vek);
            Console.WriteLine();
            Console.WriteLine("Anetaret pozitiv jane: ");
            Console.WriteLine();
            for (int i = 0; i < vekpoz.Length; i++)
            {
                Console.Write(vekpoz[i] + ", ");
            }

          //members between two given values
            int[] vekmesvlera = sherbimi.AnetaretMesVlerave(vek, -5, 12);
            Console.WriteLine();
            Console.WriteLine("Anetaret mesvlerave jane: ");
            Console.WriteLine();
            for (int i = 0; i < vekmesvlera.Length; i++)
            {
                Console.Write(vekmesvlera[i] + ", ");
            }

            //this is what I'm trying to do to find 
            //if the value exists in the range of the array
           // this method checks if the given value exists in the array or not
            int[] ekvlera = sherbimi.EkzistonVlera(vek, -5);
            Console.WriteLine();
            Console.WriteLine("Anetari i dhënë Y: ");
            Console.WriteLine();
            if (((IList<int>)ekvlera).Contains(-5)))
            {
                Console.Write("Vlera ekziston"); 
            }
            else
            Console.WriteLine("Vlera e dhënë nuk ekziston");
                       Console.ReadLine();
        }

Thank you in advance for your reply.

Posted 26-Feb-15 3:14am

dr_iton

Updated 26-Feb-15 3:41am

v3

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[no name] 26-Feb-15 11:02am

What exactly do you mean by "if a given value is in range of a given array" ?

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-02-26T05:03:00

One author of one book (sorry, I cannot give an exact quite and reference at this time), reasonably noted: "'range' is a bad term!". The set of (allowed values) is called "domain". There are two domains related to the arrays: one is the domain of its indices, most usually called 'range', and the domain of values of the elements.

If I saw only the title, I would have decided that you are talking about indices. Then you could have said some integer index value is in domain or not, this is simply index >= 0 && index <= vec.length - 1. This is almost always so, but not always. You could create not a zero-based array using the class System.Array, the you would need to do a bit more complicated check:

C#

bool isInRange = index >= ver.GetLowerBound(0) && index <= vec.GetUpperBound(0);

Please see:
https://msdn.microsoft.com/en-us/library/system.array%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.array.getlowerbound%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.array.getupperbound%28v=vs.110%29.aspx[^].

To check is some value is an element of the set of array values, you can write a function traversing all array element with foreach loop and compare the value for equivalence using '==' operator. Don't forget to return immediately if the matching element is found. This is too trivial to explain. But you don't have to do it, because you can use this method: https://msdn.microsoft.com/en-us/library/eha9t187%28v=vs.110%29.aspx[^].

You can use it with zero-based arrays anyway (which is the case with your arrays), but, generally, not with others, because "not found" is indicated by −1.

—SA