/// <summary>
/// Returns an integer array of all prime numbers between input 1 and input 2 of user.
/// </summary>
/// <param name="input1"></param>
/// <param name="input2"></param>
/// <param name="degreeOfParallelism"></param>
/// <returns></returns>
public static int[] CalcPrimes(int input1, int input2, int degreeOfParallelism)
{
var lockerObject = new object();
var primesRange = Enumerable.Range(input1, input2);
var maxParallelism = new ParallelOptions()
{
MaxDegreeOfParallelism = degreeOfParallelism
};
var primeList = new ArrayList();
Parallel.ForEach(primesRange, maxParallelism, (number) =>
{
if (PrimeFinder.CheckPrime(number))
{
lock (lockerObject)
{
primeList.Add(number);
}
}
});
var primeArray = new int[primeList.Count];
primeList.CopyTo(primeArray);
return(primeArray);
}
static void Main(string[] args)
{
var parallelismTimer = new Stopwatch();
for (int i = 1; i <= 8; i++)
{
parallelismTimer.Start();
PrimeFinder.CalcPrimes(0, 1000000, i);
Console.WriteLine($"Time in milliseconds for CalcPrimes using {i} max tasks: {parallelismTimer.ElapsedMilliseconds}.");
parallelismTimer.Reset();
Console.WriteLine();
}
}
/// <summary>
/// Returns an integer array of all prime numbers between input 1 and input 2 of user.
/// </summary>
/// <param name="input1"></param>
/// <param name="input2"></param>
/// <returns></returns>
public static int[] CalcPrimes(int input1, int input2)
{
ArrayList primeList = new ArrayList();
for (int i = Math.Min(input1, input2); i <= Math.Max(input1, input2); i++)
{
if (PrimeFinder.CheckPrime(i))
{
primeList.Add(i);
}
}
int[] primeArray = new int[primeList.Count];
primeList.CopyTo(primeArray);
return(primeArray);
}
static void Main(string[] args)
{
Console.WriteLine("Prime calculator!\nPlease input first number for your prime number range:");
int input1 = UserInput();
Console.WriteLine("Now please input second number for your prime number range:");
int input2 = UserInput();
int[] primeArray = PrimeFinder.CalcPrimes(input1, input2);
if (primeArray.Length == 0)
{
Console.WriteLine("No prime numbers in range. Sorry :'(");
}
else
{
Console.WriteLine("The prime numbers within your given range are:\n");
foreach (int prime in primeArray)
{
Console.Write(prime + ", ");
}
}
}
