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LunhCheckSum.cs
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LunhCheckSum.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace LunhCheck
{
class Program
{
static void Main(string[] args)
{
string npi = "1932104098";
if (ValidNPI(npi))
{
Console.WriteLine("The NPI: {0} is valid", npi);
}
else
{
Console.WriteLine("The NPI: {0} is NOT valid", npi);
}
}
//Function
private static bool ValidNPI(string npi)
{
if (npi.Length != 10) { return false; }
try
{
char[] nums = npi.ToCharArray();
int LUHNID = 0;
for (int i = 0; i < 10; i++)
{
int curNum;
if (int.TryParse(nums[i].ToString(), out curNum))
{
curNum = (curNum * (((i % 2) == 0) ? 2 : 1));
if (curNum > 9) { curNum -= 9; }
LUHNID += curNum;
}
else { return false; }
}
LUHNID += 24;
return (LUHNID % 10) == 0;
}
catch (System.Exception)
{
return false;
}
}
}
}