Question

Hey! i hit a roadblock in my C# program. I am just wondering how i would search for a set of 9 numbers within an array and have a message box say if it was there or not. I have it where the contents of the txt file is loaded into an array right when the program starts. Any and all help is greatly appreciated :)

each number in the txt file is like this 123445567 385910475 938405719 503818405

the array i put it into is this

const int SIZE = 18;
int[] numbers = new int[SIZE];

Answer 1

/*C# program that read an input file ,data.txt that contains the 18 numbers. into an array of size,18. Then prompt the user to enter the key value to search in the array. If the value is found in the array, then print the location  of value found in the array otherwise print the value is not found .*/

//Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ReadTextFile
{
class Program
{
static void Main(string[] args)
{
const int SIZE = 18;
int index = 0;
int[] numbers = new int[SIZE];
//Set file name data.txt
String fileName = "data.txt";

Console.WriteLine("Reading from file ,data.txt values :");
/**Create an instance of StreamReader to data from read fileName */
StreamReader fileReader = new StreamReader(fileName);
string line;
/*Read till end of the file */
while ((line = fileReader.ReadLine()) != null)
{
//read data values from the file into line and parse the value to integer value
int.TryParse(line, out numbers[index]);
index = index + 1;
}

Console.WriteLine("data.txt file data values :");
for (index = 0; index < SIZE; index++)
Console.WriteLine("{0}", numbers[index]);

Console.WriteLine("Enter value to search in the data.txt file:");
//read element to search
int key = int.Parse(Console.ReadLine());

//Set location to -1
int location = -1;
//Set found to false
bool found = false;

/*Checking for the value in the array ,numbers */
for (index = 0; index < SIZE && !found; index++)
{
if (key == numbers[index])
{
//update the found and location values
found = true;
location = index;
}
}

/*Check if boolean found is true*/
if (found)
/*Print the value and location */
Console.WriteLine("Value {0} is found at index locaiton {1} ", key, location + 1);
else
Console.WriteLine("Value {0} is not found." ,key);
Console.ReadKey();
}
}
}

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Input file : data.txt

18344
38591
93840
50345
12234
33491
93848
50341
12347
38591
93325
50351
12237
23759
93840
50231
12233
38556

Note: data.txt text file can be changed to any values you like upto 18 values.

Please make sure that the data.txt file is in the "bin" folder of the c# project folder.

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Sample Output: