5.15 - Function IsPrimeTarea

Objetive

Create a function named "IsPrime", which receives an integer number and retuns true if it is prime, or false if it is not:

if (isPrime(127)) ...


Solution

using System;
public class FunctionIsPrime
{
    public static bool IsPrime(int n)
    {
        for (int i=2; i < n; i++)
          if (n %i == 0) 
            return false;
            
        return true;
    }
    
    public static void Main()
    {
        if (IsPrime(127))
          Console.WriteLine("127 is a prime number");
        else
          Console.WriteLine("127 is NOT a prime number");
          
        if (IsPrime(1000003))
          Console.WriteLine("1000003 is a prime number");
        else
          Console.WriteLine("1000003 is NOT a prime number");
    }
}

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