using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace BinarySearch
{
class Program
{
static void Main(string[] args)
{
int[] numArray = new int[100];
bool isNum = false;
int sizeNum;
Console.WriteLine("Enter the limit of array:");
string sizeString = Console.ReadLine();
isNum = Int32.TryParse(sizeString, out sizeNum);
if (isNum)
{
Console.WriteLine("Enter array values (numeric only) in ascending order. ");
for (int i = 0; i < sizeNum; i++)
{
int tempValue;
string arrayItem = Console.ReadLine();
isNum = Int32.TryParse(arrayItem, out tempValue);
if (isNum)
{
numArray[i] = tempValue;
}
else
{
Console.WriteLine("You enters a non-numeric value!");
break;
}
}
Console.WriteLine("Enter search value (numeric only).");
int searchNum;
string searchString = Console.ReadLine();
isNum = Int32.TryParse(searchString, out searchNum);
if (isNum)
{
int lowNum = 0;
int highNum = sizeNum - 1;
while (lowNum <= highNum)
{
int midNum = (lowNum + highNum) / 2;
if (searchNum < numArray[midNum])
{
highNum = midNum - 1;
}
else if (searchNum > numArray[midNum])
{
lowNum = midNum + 1;
}
else if (searchNum == numArray[midNum])
{
Console.WriteLine("Search successful");
Console.WriteLine("Value {0} found at location {1}\n", searchNum, midNum + 1);
Console.ReadLine();
return;
}
}
Console.WriteLine("Value {0} was not found \n", searchNum);
Console.ReadLine();
return;
}
else
{
Console.WriteLine("Search value must be numeric!");
Console.ReadLine();
return;
}
}
else
{
Console.WriteLine("You must enter a numeric value!");
Console.ReadLine();
}
Console.ReadLine();
}
}
}
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