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- using System;
- using System.Numerics;
- namespace _2_PrimeChecker
- {
- class PrimeChecker
- {
- public static bool IsPrime(BigInteger number)
- {
- if (number == 1 || number==0) return false;
- if (number == 2) return true;
- BigInteger half = number/2;
- for (int i = 2; i <= half; ++i)
- {
- if (number % i == 0) return false;
- }
- return true;
- }
- static void Main(string[] args)
- {
- Console.WriteLine("Enter number");
- BigInteger number = BigInteger.Parse(Console.ReadLine());
- if(IsPrime(number))
- {
- Console.WriteLine("The number {0} is prime!", number);
- }
- else
- {
- Console.WriteLine("The number {0} is NOT prime!", number);
- }
- }
- }
- }
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